help, need parts for sporty

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Hi, just bought a sportrak to help with my gamekeeping and hit a problem with its test.
It needs 2 front bottom ball joints and I carnt find a dealer in my area or some1 that does copied parts, I live in the sheffield area, south yorks if any1 could help I would really appreciate any input, regards, Paul.
P.S its a k reg. Sorry for my ignorance, not much of a petrol head.