and by chance does anyone have one or know where i can get a replacement..........thankyou

Yes, Eurokit.
http://www.eurokitlucca.it/Old_Site/...l_frameset.htm

Hmmmmmmm!!!!!!!. Are you sure?

pretty much,
Page 9 of their catalogue... looks very much like the following items (depend on the size):
CAR/15175/000 wheel dia. 50/60 mm
CAR/15176/000 wheel dia. 65/70 mm
CAR/15177/000 wheel dia. 75/100 mm

From the link above, choose download at the bottom of the page, then landing gears.

I had the same problem also. Could not get the replacement so I drill the broken piece out and replace it with a bolt from home depot no more problem. pin it to keep it from turning