A couple more questions (parts & recommendations)

I bought a new alternator from ebay rather than refurbish my old one, it not "exactly" the same but it looks great and works.
Tip (if you buy a new one), clean the alloy to remove any oils (mask the plastic), then paint it with "clear VHT paint", couple of light coats and it will look new for years. ( problem is it makes everything else look old in your engine bay) I bought a head lining in melbourne about 7 years ago, I think "classic motor trimmers". It fitted pretty good and looks Ok compared to the original. New Original clutch pressure and clutch plate in mine, shop around and you can save some money.
Mark

Paul Dunstan from this site does a rear disc conversion using r31 calipers on the escort, im sure it could be applied to the capri

Maybe Contact him and go from there

Hyd handbrake is illegal so finding a rear caliper that wears a cable actuator is a better option. Cars like Focus, Mazda 3/6 , and many others are cable operated, there won't be much difference between them and are slightly more common for parts or replace.
The type of diff in the V6 Capri is an Atlas , I don't think the brackets Paul makes will work with the wider drums(axle poke out more) but it's nothing some spacers or washers can't fix depending on how they mount etc .

Pro stitch motor trimming
0295473424
Nice helping people

An atlas diff Was used in the V6s.