I'v got one of those adapter plates, sitting on one of the storage shelving, that's also missing the crankshaft spacer plate.
I never actively went searching for one, but i can tell you just that piece would really be unobtanium to find, and purchase.
Very few people even know what that plate and spacer, is anymore.
And an FYI for you here.
There were 2 different spacers made.
Depends on the "snout" of the torque converter which spacer was bolted up to the crank.
So be aware of that, too.
As already advised, get a 727 torqueflite trans for the slant 6.
And my 2 cents, 300 bucks is way to much for just the plate, missing the spacer.
You can come up a trans for way less than that.
