when i search i just put in 'mk1 golf' and trawl thru the 6000 odd parts, i got sills, rear arches, wing, front panel, front and rear lights,
the parts are there you just have to be a bit patient sometimes, quarter panels maybe the most difficult as you will probably need a donor shell, same for rear hatch.
crazy quiffs do panels but a bit pricey, also waterwagens on ebay