Here is 1 each of P/N: AN5012-20  # 20 SPLINE PROTECTOR CAP ( PLASTIC ) in NEW & UNUSED SURPLUS condition. 

** This CAP can be used on Stearman's with Continental W670, Lycoming R-680, Curtiss Wright R-760 & earlier R-975      series engines with #20 Spline shafts **  

***As well as any other # 20 Splined engines. As always this is an Original MFG'D items. *** 

***** See our other auctions for more "Special" tools and items. ****