Help What are Hemi distributor shaft lengths??

I have a couple of old distributors.

I don't know the proper lenth for the shafts on a Hemi distributor
Betweeen

392 which is the longest I think

are 331 and 354 the same?

What about Desoto or Dodge hemi?

I am measuring from bottom of the surface the sits on the block
1 was 4.625 inches?
1 was 4.30 inches
1 was 4"
can anyone school me here??
Thanks Aaron SAVAGE

 

my info shows4.5" for 392, 4.25" for 354.