Thanks, Dennis, though I have to confess that the "seemingly effortless walk down the long lane" was the result of very many attempts to get the tune...
They all look close, you could take a chance and see if it works. The size differences are small. The cover is generally the thing that is missing so...
If you have a question for the builder regarding the warranty then perhaps it might be best to take that up with him or perhaps the person you bought...