Ok here is the deal. I opened an account to buy Quaife lsd units and asked about the Qdf5v. It is available and able to import from the UK. I ordered one and am going to test fit it to both my abs differential and then an asr one. I did 3 qdf9v installs last weekend and one more this weekend and two more in the upcoming month. I will have to wait about a month for the qdf5v to come in and then the deal is if I can get an order of 30 units that there is a big price break. It should fit all the 210mm diff housings up to 2002 when they switched and then the qdf7v goes in. According to the epc any differential with the 210mm ring gear until then with the 2.7 to 3.06 gear ratios should have the same carrier. I am going to test fit as many differentials as possible before I do the final install in my car. I guess the question is then if this thing fits all these differentials then how much interest is there. Regular retail is 1350.00 I should be able to get the price down a couple of hundred if the 30 mark is reached. Again, this should fit everything from the w107 era cars to the w210 and 140 chassis and w129. I talked to Richmond about using spacer on the ring gears if other ratios are to be used and they said that was very doable and also I am measuring all the bearings and set up that Richmond sells for the later 210mm diffs. So far it seems as though they may bolt up within shimming range.