I did some web surfing and have come to the conclusion that PTR03-52083 and PTR46-52080 are both quickshifters for the xB2. However, both are TRD and for whatever reason the first of the two is only $229 w/install and the latter is $335 and there are much fewer places to find it. Next time I place a part order at my Scion dealer, I'll ask them to run the two numbers to see whats diff.