I had a 12-bolt leak because the aftermarket seal was seating too deep on the end of the yolk. The side by side measurement of the original OEM seal (rubber) was 1/8" shallower than the aftermarket seal(s) so I put a 1/8" spacer (welding rod) between the aftermarket seal and the housing to keep it from being too deep. I have a picture somewhere comparing the OEM flange type seal with the aftermarket seal. I'm glad that I kept the old OEM seal or I might not have figured it out as quickly. That's what worked for me.
|