I don't have a fresh one (have a couple I intend to work on). But can offer a tip. According to Real OEM, the same part was used on the E12 US 530i and contemporary 630i. That doesn't make it available! But maybe ask on some other forums... (Aux air valves have many variants and don't appear to be more broadly exchangeable.) Oh, and I didn't notice you were in UK. Don't know that there is any exchangability with Euro cars.