mk3 parts to my mk1

hi i have a mk1 clipper and have a 98 mk3 what parts will fit my clipper? brakes suspension power steering

None of the above! What engine does the Mk3 have? GEarbox and engine might fit, depending on what the Mk3 is.

Things like wheels, tyres, battery, fuses, maybe rear brakes? etc will fit.

what about steering wheels what ones can i use?

i believe the spline shaft is different for mk1 and mk2/mk3 etc