Nice one, i didnt realise there was a difference between 21 and 28.
I know 18 are different as the steering stops are at the front rather than the back.
I was toying with the idea of taking it off my wrecked 28 sp, but I have now found that standard cards are available. so its wont be too hard to dump an engine in the 28 slap some old bodywork on it and get it going again. Again I will need some new forks but some R ones shouldnt be too hard to find.
Cheers
Leigh Frost
51 Tibbs Hill Road
Abbots Langley
Herts
WD5 0EE