MK3 one will go in if you also fit the fusebox -> clock loom and jump pin D/8 to E/2 (see my fusebox faq) you also need a speedo sensor from a MK3 with an 020 based rod box (basically all of em except 1.4 and 2.0 16v)
Corrado one will go in with your existing speedo cable, using the fusebox->clock loom again.
both sets will need some modification to sit in the mk2 dash, but shouldnt be too hard.