Mercury Passenger/Pillion pegs

I have a 1970 Mercury that I am sorting out. I am pretty sure the rear pegs are not correct: the rubber doesn't look like late Dominator and when I put the correct rubber on the pegs (apparently same as Commando rear) they are too loose and would fall off.

I would really appreciate it if someone could post a photo or send me a link so I can see what the Mercury passenger pegs look like.
Norvil sells these: http://www.norvilmotorcycle.co.uk/069967.htm
Is this correct for a Mercury? Does it have a bolt and a nut?

Thanks,
Stephen Hill

Have you tried RGM and oldbritts in the states etc...

Hi. Thanks for the suggestion on those parts suppliers. The problem is there are no parts books for this bike. While I don't have a correct example to look at, I think a 67/68 Atlas has many of the parts. But too bad the Atlas parts book is not well illustrated. This is why I asked for some photos. (Which I now have!).
Stephen