Originally Posted by OldCoot
Which one? Plain old bottle jack or air/hyd? Can do some measuring and take some pictures tomorrow.
Adaptors are different sizes due to the difference in the height of the jacks and the difference in the diameters of the rams.
Round one is what I carry with the bottle jack. 7-1/4" long, pipe welded inside is 4" long which leaves 3" for the ram to go inside the adapter. The bracket on the side has 3/16" gap to catch the flange on the frame.
Square one is 5-3/4" long and has 1-3/8" for the ram to go inside the adaptor. Bracket on the side has the same 3/16" gap to catch the flange on the frame.