Have you called or wrttien to Eurospares in the UK. They have a car they have been "breaking" for a while. You can also try lambostuff.com and call a few dealers... The prices on some and I do mean only some Jalpa parts is very reasonable.

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Sold #FLA12191 in 2002
Currently
Jalpa #FLA12242 is in CA being reverse engineered to help supply parts for future rebuilds,

Jalpa #JLA12411 Possibly The farthest North Lamborghini in the World (having made it to the Arctic Circle in 2006!)

I won it, bought it, now own it. Jalpa #JLA12382 Being restored in NH.