LENGTH 1.25" FLANGE DIAMETER 1.95" THREADED HEAD NO 50.61 358850-38 This crank bolt has a 1.95" diameter flange and 1/2-20 threads, it has a length of 1.25".

LENGTH 2.05" FLANGE DIAMETER 1.45" THREADED HEAD YES 52.86 358850-50 This crank bolt has a 1.45" diameter flange and 1/2-20 threads, it has a length of 2.05". There is a 1/2-20 thread in the bolt head.