I am about to do an Arnott suspension conversion to over coil springs, have purchased a
PORTER-CABLE Impact Wrench, 7.5-Amp, 1/2-Inch (PCE211) which set of impact sockets do I order for 2004 XJ8 VDP, SAE or Metric?
Also, is there a list anywhere of the particular sockets that I will need to complete this conversion. Many Thanks!

Not sure of specifics, but they should all be metric on a modern Jaguar.

T60 Torx, 13 and 17mm, you can do it with just a ratchet. get a ball joint separator for the top link

Thank you!