95 & 96 C40 is all I see and they are not available new anymore.
I have no idea why or what is different from all the other 40 & 50s
Seems the 40elrt uses the same unit as My c40TLRX, but the C40elrt does not
no idea what difference the #10 and 12 have different
If I were you I would look at all the parts in the parts break down for your C40 and the regular 40 ELRT to see what parts are different to see if you could possible use the #10 instead of the #12
Looks like shifting and water pump stuff is all different