Anyone know what the number code stands for? The YZ 06 exhaust cam has the # 5TA 12180-10-00 The WR 06 exhaust cam has the #5TJ 12180-20-00 What does the TA and the TJ stand for and what is the difference between the cams? I (stupidly) are wondering if an 03 exhaust cam will fit into a WR 06? The timing on the bike should be ok as the mod on the wiring sorts that issue. Will a swap like that be straight forward? Is there anything else to be aware of (shims) etc! Has anyone tried this on such a late model bike? I shouldn't be thinking like this!