Mike (carguy55) did a nice job responding per above. The RacingBrake silicone high temp dust boots are nice, but the stock ones are cheap and easy to replace plus aren’t damaged by brake fluid. Either are a good choice.
If rebuilding a J6H / J57 front caliper (including the larger BCD J6H), the vented piston kit (per caliper) is 19207043. Those are 2mm longer pistons than the J56 vented ones (23242510) that work in a J6M front caliper.
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