Thanks for posting the drawing Terry, very cool. FYI, the Bass Boat (1970 Hemicuda, SPD 203) also has this oddball style of baseplate, so I have 3 cars with this version. I agree that the slight raise in the bubble height is very cool, thanks!

Here's some pictures of the bolt Mike. It is 1" long from top to bottom, has a 7/16" head, and has a 5/8" captive washer. Both shaker bubbles have long-use indentations that exactly match this 5/8" diameter washer.

- Wade

FM3 Shaker bolt 1.JPGFM3 Shaker bolt 2.JPG