Bit of a wide-ranging question Mat.
Which Discovery do you want to fit them on??
Roughly speaking
Series 1; any Series, 90, 110, Defender, Range Rover 'Classic' will fit
Series 2; It had a differant PCD, & only wheels from that (& the P38?) will fit
Series 3; Lend me £20.00 :lol:
101FC rims only fit the 101FC, as they're 6-stud.