Small Format Interchangeable Core A2 System Pinning Kit. Includes 100 of each color coded brass pins, bottom sizes 0-9, top sizes 2-19. Stamped and machined caps, and 6 and 7-pin spring covers. 108B Long and 108F Short Springs. A 3-in-1 Key gauge for A2, A3 and A4 Systems. Wedge shaped metal box measuring 11-1/8" x 8-1/4" x 2" (Front) x 3-1/4" (Back).
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nut the best kit to use is the original Sargent 437 RC/UL as referred to on the 18th page of this document:
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Is it will include the additional pins and other items to properly key those cylinders has mentioned in that catalog.
while you have the catalog open you can also see all of the different part numbers for the different pins as mentioned on the previous page but that entire section is very helpful when it comes to the servicing of Sargent cylinders.