If you're thinking of a punto GT style upgrade you need the vented disc brakes from a 1.6 auto, 1.8 or 1.9TD/JTD bravo/brava/marea. These need 14" wheels.
The 1.2 and 1.4 and 1.6 use solid brakes. The 2.0 HGT uses larger brakes which need 15" minimum wheels.
You can get new discs/pads and check which vehicles use which brakes on
www.shop4parts.co.uk