Pillion pegs issues on my 1951 ES2

My 51 ES2 is missing the right side pillion peg mounting lug; called the "B4/686 Frame pillion footrest lug". See page 69 of the Norton Spare Parts List, bottom of Plate Y.

I have been hunting for this lug but realize that unless I find an ruined frame and rob it for this one lug...I will have to take off the existing left side lug and fabricate a replica.

In the meantime, I ordered new footrests and rubbers from the NOC but they are quite different from my remaining original; see photos. They have the same threaded hole on the left side, but they are 1" instead of 3/4 centers and the internal diameter is VERY different. As if it was meant to fit a much wider lug.

So...am I missing something ? Is there an earlier and a later period foot rest ? or is my existing left side foot rest NOT a real Norton footrest ? It had an ancient John Bull rubber on it but I did not expect the metal part to be wrong. I can cut and bend down my new foot rest to fit but that will be a fair amount of drilling and blasting...perhaps there already exists the correct sized part ??

Can anybody enlighten me ?

and (grasping at straws here)...does anybody out there know where I might find one footrest mounting lug.

Grant MacNeill, Toronto