I didn't realize you are in Ireland, that does make a difference. You may be able to find parts on rockauto.com . Look for a manufacturer's name and part number on the caliper, Spartan sourced the calipers from a vendor like Bendix or Rayspestos and parts should be available
Our fuel in in the $4.20 range US but we don't have near the taxes y'all have on petro or diesel. Let it be known you will be in the US and when on the Just Conversation forum and you may be able to get some response.
92' Holiday Rambler 1000
The wife, me and two furry kids
If you have it, a truck brought it.