I would imagine a decent auto factors in the Uk would do them. I got my last edging from fleabay.
The foam stuff I thinking of is fairly dense rubber, so should be fine in the joints. Obviously many of these things depend on what you can get hold of.
Search Rubber u edging on eBay. You can find so e with metal reinforcing in it which is very tough. I used in on my boxes in the boot to stop the l I'd rattling and provide a friction close.
Dan
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