Geoff, regarding spare parts prices that I may query at times. I don't think that anyone can tell the difference between a 450 flex disc and a genuine 6.9 unit. Frankly, I would be surprised if 6.9 units are still available, in ORIGINAL guise. As I pointed out, I have 450 units, and I can fit them. No one would ever know that they are not 6.9 units.
Contrary to your belief, I don't hold unsold stuff now, and never have. Nor have I ever been stung by parts pricing that I have not been able to amortize in some way. You know, if we are talking about genuine 6.9 versus alternatives, just take the Air Cells as an example. Nowadays, you only buy Ch. 126 units, according to MB part numbers front and rear. 6.9 units can no longer be bought. So, if I raise these matters with you, it is not a form of criticism directed towards you or any parts supplier, including MB Spares. I ask these questions simply to stay on course with situations and issues that concern me as a long time 6.9 owner. Regards Styria