help with flange

[bugsoup]

I just did the same swap on mine. Are talking about the "washer" that is a tight fit on the transmission side of the flange? I didn't see where this washer went on the 181 flange but I think its just a deflector for large debris. Sort of like the one that is on the crankshaft of the engine, behind the pulley. Anyway, this probably don't help you, but I am just going to leave it off.