Front brakes

I'm looking for a nearside Mk2 MG metro vented caliper for my Mk3 and they seem to be rarer than hens teeth. Is there an alternative or a conversion that doesnt take much work?
This forum is for Midas and Midtec Bronze enthusiasts. The Midas is a British car designed as a replacement for the Mini Marcos.
http://midasownersclub.co.uk/forums/
http://midasownersclub.co.uk/forums/viewtopic.php?f=54&t=3087