BW12 transmission flange

Gents, is the correct spanner for above a 1 5/16" (before I get under and pull it all to bits to find I have the wrong one)? I have to replace the seal at the rear of the tranny. Thanks Paul

Hi Paul, it’s actually 1-1/2" (same as the manual FYI). Have 2 BW12’s in the garage and just checked to confirm.

Thanks Mike, The one at the harmonic balancer is 1-5/16" - just hoping. Now I have to buy another socket. Paul