ash deacon

Hello, calling on all the people out there with a wealth of information and knowledge on cubs. I am hoping to find out which bike the forks I have, have came form so I can match a brake back plate to it. I am making a 1963 trials cub out of a standard T20, I have recently bought a set of heavyweight forks and yokes which are internal spring, as the T20SS and SH had of that year had - seemed best suited. So the problem is that the bottom members in the parts list say it should be p/n's H1117 and H1118 but he p/n's I have on the fork legs are H1119 and H1120. I have been through all the part manuals I can find for all bikes made by triumph from 58-64 and they only show the H1117 and H1118 for the closest match, at 64 it went to external springs so I know its before then. The only visible difference I can identify between H1117/H1118 and H1119/H1120 is that one leg has an additional cast feature for the brake cable to attach to the leg right at the bottom of the leg next to the threaded hole for the mudguard. Any advice is welcome. Thanks Ash