Most of the stuff you want you will most likely find in junk yards or on ebay. People also post parts on this site. If you have a few free hours, I would also recommend plugging "1991-94 Capri" into the Craigslist search box and just go city to city and see what you come up with.
Of all the things you list, the trunk supports are probably the easiest thing to find. They still stock replacements in auto parts stores. I suggest you get the XR-2 supports, since they are stronger to lift a trunk lid with a spoiler on it and therefore will be more robust and last longer. It's been a while since I purchased any, but I think I got mine at Auto Zone for around $15 each.
