Foam surround for a speaker with a cone size of 7,7 cm

The Realistic Minimus 77 is nearly impossible to repair because the woofers use a non-standard size speaker surround/suspension, and after 35 years almost all of the original surrounds are rotting. Every online tutorial to repair them shows buying two different surrounds and gluing them together to make one that fits because it's almost impossible to find a properly-sized surround. This surround, #F43C4, is the only product I've ever seen that actually fits the speakers with no modification whatsoever. You can even install it BEHIND the speaker cone like the originals were; you don't have to glue it on top. The only thing to keep in mind is that the hole in the surround is a little smaller than would be ideal for those odd-sized cones so it requires a little extra glue to stop it from buzzing. You can also cut the little bezel off the inside if you're very careful, and that will make it fit even better.
This is a really nice product and I, for one, am relieved to have found it. Thank you! 5 stars for the convenience.