If you already have those units, you might consider having them refurbished. I had my B6 units refurbished through Balance Motorsport who worked out some different damping rates to suit car better. I actually went direct to pick them up from Bilstein in Leicester when they were ready.
May be worth getting in touch with both companies. HTH
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 1985 Audi 90 quattro 20v turbo with some tweaks
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