Worst case you should be able to get hold of twin-wall polycarbonate sheeting that you could cut to size - which is easy with a hacksaw The lid on an ancient propagator of mine went yellow over the years, then cracked, then bits snapped off and it was a gonner. I found the polycarb sheet worked well
Knowledge is knowing that a tomato is a fruit. Wisdom is not putting it in a fruit salad.
My ancient, large, square Propagator lid succumbed and there were no new ones like it. The replacement was rigged up from plywood, laths and bubble wrap and has worked well for a good few years. I made another replica this year, fresh and ready to go in the spring
You have probably sorted this but now, but... I sent off for a replacement Stewart propagator lid and what I got was a rather flimsy affair, so if you can source one and you want something more solid make sure you know what you are getting. For Stewart, there is an 'essentials' one which is 'thermoformed ' which is the more flimsy one. I think the 'hard' one is ' injection moulded crystal styrene' one. They have them on Amazon.fr but they are hideously overpriced. I take it Point Vert and the like don't sell them...? also https://www.hydrogarden.com/fr-fr/propagation/propagators/root-t-propagateur-couvercle-57x37x15cm-x-18-12--550--035?returnurl=/fr-fr/search?q=propagateur+couvercles
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The lid on an ancient propagator of mine went yellow over the years, then cracked, then bits snapped off and it was a gonner. I found the polycarb sheet worked well
Wisdom is not putting it in a fruit salad.
also https://www.hydrogarden.com/fr-fr/propagation/propagators/root-t-propagateur-couvercle-57x37x15cm-x-18-12--550--035?returnurl=/fr-fr/search?q=propagateur+couvercles