Make sure they aren't KTM WP's, as there are slight (but important) differences in the bottom fittings. The caliper will bolt to either fork lower, but the lugs are thicker on the KTM base and move the caliper inboard, causing the caliper to ride against the rotor. Also, the axle wrench end (right side, with the hex) is smaller on the KTM version than the GasGas. This is comparing a set of 2002 GG 43mm USD WP's with a set of 2001 KTM 43mm USD WP's. I am at work tonight, but I can look at the foirks tomorrow and get you some part numbers, if you want.
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Phil
(New bike pending...)
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