Thanks for the help guys. I called Mike at AD Weddle (super nice guy, thanks Grigg) and he asked questions and for me to send pics. When I mentioned the "bolt on" rear cover that seemed to deflate his enthusiams a little; meaning there may be few if any options.
My axle is Budd, stud piloted. I know some Ford F600 and F700 through the eighties ran the 6 hole stud piloted with the same bolt circle, but I don't know if the WMS widths are close in measurement.
Here's the pics I sent to Mike at AD Weddle:
https://plus.google.com/photos/115050180406101428512/albums/6016166230405970849
