[Aussie Mike]

Hi Spec used to list a complete kit for the Jag front end. They will probably be able to supply everything: Calipers, brackets even disc if you need them. Give them a call.

There's plenty of dimensional drawings of calipers on their web page and AP and Wilwood have the same sort of drawings on their web pages. You should be able to wave a tape measure round in your front end and quickly determine what will fit.

Cheers