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Hello George:
276513-9 is Repair Kit, Master Cylinder (No footnote) Looking at the diagram (which I e-mailed you directly), it looks like it contains many of the springs and seals found in the body of the master cylinder, as well as the rubber cap on the front and the seal for the screw-top lid at the top.
276572-5 is Repair Kit, Operating Cylinder 668365 (Footnote: P120 ch 225020 -, P130 ch 216950 - 264205. P220 ch 44600 - 57395.) Looking at the diagram it looks like this kit contains the rubber cap, the seal, the lock ring, and the rubber cap for the bleed nipple.
What do you need exactly? I changed out my slave cylinder last year after first buying a new seal which did not solve the problem with the old cylinder. I still have the new seal and I might be able to salvage other parts since I saved the old unit.
Cheers,
Jeff Pucillo
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