Thanks guys, the information is great.
My 73 still has some very good original parts fitted, including a mx peanut tank, just missing a few bits. Seat, rear guard and a motor that works.
I spoke to someone, cant remember who, about 15 years ago when I purchased the bike and they thought around 6-8 may have been imported. Not far off the mark.
I have been on the Penton Owners Group website, great site, looking at colors and standard bike fittings for the 73 model. The color of the tank and airbox on mine was a similar color to what the Mettco Penton 125 was painted in. Sounds though like it should be a red as per the fibreglass color.
Rosco pm sent.
thanks