I did manage to find an alloy 78 CR250 fuel tank today in fair condition, but I am still in need of the rear brake mechanism.
I also found a reasonable one for my 75 MT 250.
If anyone needs what looks like early CR125 (I think) steel tanks I managed to find a few off them also.
Also early MT125 and 250 exhausts some with heat shields (on the 125's) no heat shield on the 250's.
I even found a Montessa fuel tank but not sure what year or model it was off.