John,
I got it from VintageAir and I believe it is the Sanden SD7. Go to
VintageAir Catalog, then go down the page to number 48 and select.
I think I have some drawings of what I fab'ed up. But it is pretty basic: 1. bolt with spacer into the larger head threads and then an arc adjuster coming off one of the water pump bolts (as I recall.) I'll see what I can find for you.
Lynn