Our (USA) "E-BAY" web site has lots of Z stuff all the time...I suggest lurking on that site...you might find the things you want...Fourways (I think) is a pretty reputable company...didn't they make the $70,000 dollar Z-Car???...it was in one of your Brit car mags a while back...bee-yoo-tee-full!!!!...Good Luck... 
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