Trackpad replacement: what is compatible? What are the part numbers?

I got a MacBookPro5,1 15” (MB471LL/A - A1286 − 2255, the 2.53 GHz model with 4GB RAM, 320GB HD etc.) off eBay and I love it. It has one small problem though: the top ¼ of the trackpad is non-responsive.

I am pretty sure that it is a hardware issue (though when I checked for bent pins, I didn’t see any). I am looking for a trackpad for sale: unfortunately iFixit does not have it. Used replacement trackpads go for $30–50 on eBay, but I am not sure what part will be compatible with this computer.

922-9008 - I think this is the part number of the trackpad I am looking for

661-4948 - I think this is the part number for the entire upper case (including the trackpad), at least that is how it is listed on iFixit.

On eBay, there are some entries that say they are the trackpad but with model number 661-4948. Do you think this will be the part I am looking for? How about trackpads for the 2010 15” macbook pros (922-9063 or 661-5481)? They look the same, but would they work with this machine, or do I need to be careful to get the 922-9008, specifically?

Thanks to anyone who can help or direct me to help!