N.O.S. Payen no. NB021 - old no. W127 N.O.S. Pioneer with no.s on it (if they are relevant) Used, Moss supplied type mentioned on your site by Robin Godfrey in 2005 Used, might be an original type AEB156 as it came out of a low mileage Twin Cam

On 2/16/2024, Richard Gough wrote:
"I thought that the different seals I have found may be of help to someone who is rebuilding one.

For the pairs of pictures below, the first (left) is the seal side,
while the second (right) is the side that gets pressed into the housing

   
Payen Pioneer

   
Moss original