Agree with Norbie. Disagree with Brett. Rear dampers are pretty basic things, a competent suspension shop should be able to cross-reference a solution for you.
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idealy id want the car to go about another inch or so lower at the back than it currently is, (2" lower than stock) but i'm worried that this lack of travel might be fucking up the roadholding ability.
I'd be more concerned about bump travel/bump stop clearance. You could modify the bmp stops if this becomes an issue. 2" down with an acceptably firm spring rate shouldn't be a problem.