There is a Hydratrak LSD Diff for sale on ebay, ends tonight, so be quick! Purports to be for a ZTV8 but I have not checked the part number. No bids yet, so might be cheap! but there is a Reserve.

I can't work the hyperlink (perhaps Tim can add) but if you search ebay with Hydratrak and MGZT V8, it should come up.

http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWA:IT&ih=008

Rear Ltd Slip Diff HYDRATRAK DANA Ratio 3.46 L@@K !!!

Oh, and there is an engine for sale as well:

2004 MG ZT 4.6 V8 Engine

http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWA:IT&ih=013