::XA63525 INJECTOR SIDE 660CC :this is a injector collar that allows 63507 (850cc below) to work on that fuel rail.That part number is indeed an injector part number not a collar. The collar part number is XA63521. The main issue with Denso/Sard injector is that they do infact need collars for a spacer for proper fitment into a rail. Its a shame that the collars from SARD run $45 a collar which is a little rediculous if you ask me.
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