The plastic ones that we make are easy to re-drill to fit most any application, and the work well.
http://www.kartlift.com/e-store/index.php?route=product/product&path=13&product_id=61
KartLift Kart Stands
DeepSeat Kart Seats
877-777-8020
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Don't bother PMing me, it doesn't work. Email is best: tim@kartlift.com.