37521-33P28 = TT application 37521-33P29 = NA application That said, both seem to be NLA from Nissan. The actual difference is pretty hard to tell, they will interchange in practice. TT ones seem to have had this dust cap, NA ones didn't. You can remove it from your old one and swap it over FWIW. NA
TT
Bernie Bilski berniebilski@cox.net President of Z-Car Club of Northern Virginia1995 Nissan 300ZX TwinTurbo in Cobalt Green 1997 Nissan 240SX SE in Ultra Red 2006 Nissan Frontier SE in Ultra Black
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