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Some say M15/M26 and some others say M15/M22
There's your clue. All the bolts which go into the axle are M15 (i.e. 15mm nominal over the crests of the thread), but the cap which goes into the crank and retains the bolt for extraction purposes is either M22 or M26 depending on the crank model. I think the M26 is generally for carbon cranks, but it's easy enough to measure the cranks if you have them in front of you to find out exactly which one you need. If the hole it goes into is ~20mm internal, it's M22, if it's ~24mm it's M26
gbj_tester
Are SRAM GXP self-extracting bolts all the same? Some say M15/M26 and some others say M15/M22. Bought the cranks second-hand and the person obviously lost the bolt so I can't compare