The A and D type are very similar, the major difference being the bolts as
opposed to the studs. If your spindle has a short taper, plus four holes
(or more) tapped around the face, it's an A. Cam lock of that size would
likely have six holes, probably 3/4" diameter.


Here's a web page for "D" type spindles. The next page has L type. Didn't
check but I bet bet they are all there. Pics dimensions etc.

http://www.toolingsystems.com/cushman/manual/page4.html

Karl