#4 PostAuthor: simon gilling » Sun May 06, 2007 1:09 pm
They are probably after market, I have some air fork tops by 'road rider'. They were a popular mod in the 70s/80s. I guess they will do no harm as a 'period' mod. Just don't pump them up too much as this may blow the fork seals.
There are quite neat replica fork caps for sale on ebay ocassionally.
Simon G
Don't ask me, I just got here myself!