Thought I'd update with the ending.
Imported the diff through Rodney's guy - I sourced the diff myself though, and Ralph took over the arrangements getting it here, all-in-all I was charged R10,000 delivered.
Took a few weeks, diff arrived, and was stuffed (ordered from what I believe was a reliable S2000 part dealer,
www.hardtopguy.com) - the seller pulled a fast one and the final drive was history. Paypal wouldn't register a claim of this type, and my only option for a refund was to send it back at a cost probably greater than the initial layout. (no fault of Ralph, they went out of their way to assist).
I was fortune that this diff wasn't as damaged as mine, and could order parts to repair it (Another R10,000) - ordered the parts, the diff was built up last week and returned to me - I have now sold the vehicle at a stunning R70,000 after all the expenses (sold for R90,000). I sold it around R40,000 less than what I could of, as the diff needs 1,000 mile break-in, and I honestly don't have the time or patience.. so who ever took it, took it knowing the risks.. I was blatantly honest with the various buyers, scaring a few away - but I didn't want any come backs.
The final buyer actually flew down on Saturday, came round yesterday, took the vehicle for a test drive, was happy and handed me a cheque for the agreed amount, he then took the car out for the afternoon, can back and asked me to drop his rental off at the airport - he then left for Johannesburg by car last night. Phoned again this morning to tell me he's loving it - and thank you for not pulling a fast one.