Allotment shed can anyone help!?!

I sending out this message in the hope that someone maybe able to send me the right direction, before I attempt to build my own shed
Just received my application form from my parish council to erect a Tool shed on our plot but they have given very precise dimensions (Taken from the application)
The Shed shall be of the Lean to type with the dia:
Width 3'6"
Depth 4'6"
Height (Front) 6'6" (Back) 5'6"
If anyone has any ideas where to get the above online please let me know
I've been looking in local garden centers and online all day and can not find anything that matches this size, I have given the council a call to make sure that they haven't got the sizes the wrong way round or if there is any movement on the size or style (which I got a no to both)
I get the feeling they just don't want us adding sheds to our plots
Posts
Have you looked here-it is all in cms-don't do cms
http://www.greenfingers.com/superstore/product.asp?dept_id=200406&pf_id=LS6713D
Very unhelpful dimensions as sheds/tool stores tend to be 4ft, 5ft etc as you have no doubt discovered. Is there anyone else on the allotment who has what you're looking for and can tell you where they got it? Otherwise, how 'handy' do you feel?!
Sotongeoff - I've already seen that one, thank you for finding thou
FloBear - All the other on the allotment had there sheds up before all these new rules came in so it doesn't affect them
Thinking I may have to aquire alot of pallets and find out how 'Handy' I am 
Brumbull - I get the feeling that 'they' don't want any sheds put up on the site, hence the odd sizes!
Thanks all for your help so far thou
I wonder how old those regs. are. They may have been drawn up a long time ago when that size was common. The PC are supposed to represent the views/wishes of the residents. It may be worth going along to a meeting with a few other allotment holders and make representations that a little flexibility is required here!
Drawn up middle of last year (about a month before we got the plot) I thought about seeing if some of the other allotment holders would attend a meeting with me, but sadly they haven't a problem with it as it doesn't affect them
I wouldn't mind Brumbull if they had given sizes that are available, I've even asked if I could put a smaller sentry shed there instead (3' x 2') and got a flat out no!
Tomtom, whoever drew up the dimensions wants badgering until he/she kindly tells you where to obtain a shed of the precise dimensions given. Start with the chairman of the PC and get him/her to put you in contact with Mr/Ms SmallShed. Then phone and email and hassle politely until you get some help. I am a councillor in my village and I believe that we are there to represent and help the people who elected us, not to be awkward and obstructive!!!
Edit - I cannot believe the irrationality of someone who says you can't even have a smalller shed!!!!!!!!!! I think you should go to the local press and tell them your woes. It's completely ridiculous behaviour by the PC.
HI ,My allotment rules are much the same as yours, in order for us to get permission to have an allotment we had to sign a contract that the plot would be only for 11 calendar months and that no permanent structure be built above 5ft and No poly tunnels or Greenhouses except small tomato grow houses /cold frames would allowed .I think the Parish council are worried that there would be a haphazard amount of jury built sheds creating an Eye-Sore
Derek
Ah FloBear I'm not one to back down, I shall be going down to the PC on my next day off to have a chat, I'm sure they would rather I buy a well made shed then attempt to build one myself lol. Thank you for your advice, sounds like some good ideas there
I get where they are coming from clogherhead, and fully understand I just think it is unfair that they will only allow the dimentions given with little flexability, esp when the sizes are not standard and would have to be custom built.
Further on it states the excate colour and product needed to preserve the shed (and there was me going to paint it all the colours of the rainbow jk lol)
hahahahahahahaha