Big step today. Finally got the right switch from a local auto store (special order or course). It's part number can be either FF2511 or NS71701 depending on who's catalog you are using. The next shot shows the first attempted switch below the shorter (better) one. I still had to round off the button tip for it was also too square, but other than that, no washers required and it works perfectly. This weekend, new modified tranny top goes into place and I'll start installing the backup lights.
http://community.webshots.com/photo/141689703/142609131lkffVs