Now your in trouble as that is not a replacement part and actually has no part number. Its just called a "belt wheel"
I havn't seen it sold with any spare parts for the tail on a CP I would take the tail in and see if a Trex wheel fits.
Do you have the big manul for that CP?
If not here ya go.
http://www.twf-sz.com/english/downlo...ual/Beltcp.pdf