reminds me of the Eames chairs but those are getting quite expensive (even though they're ugly

) (DSR / DSC series)
Miller and vitra had them (have them??) but that's not an option I assume...
but indeed some schools had at least very similar chairs
to the original Eames design:
if you want to keep that design, I'd say get a bit of fibreglass and repair it,
otherwise get a different seat (that'd be cheaper and/or more comfortable)
24hr sale on gku
http://gokartsusa.com/Gokart-Minibike-Seats-Azusa-Rupp-Taco.aspx
same seat as Axx3d posted for $52..
'sid
[
EDIT]
Sooo I checked your other thread..
what you have appears to be a vintage FOX flyweight kart that was badly messed up by a PO.
poor little vintage kart
Anyways..
the ORIGINAL seat it came with is called "satelite seat" (yes incl the typo

)
(see attachments)
[
EDIT II]
Oh look
we have better pics