Hi,
Have attached some photos. Lower fork leg, left hand side required. A right hand side one will be OK.
The previous owner tried to weld mounts to the leg for a disk caliper. I will not bore you with my option of his mental capacity at the time of that decision
The forks have 38mm fork tubes. I beleive they where fitted to KTMs as well as Montesa bike along with many other Euros of the period '79-'83.