Sorry to confuse you David, allow me to explain.
We were discussing the cupholders, which are available for € 37,00 / £15.18 (US$33.50 each + dealer markup). That's for MY2000+.
I was just remarking that discussing the price of OEM MB parts is generally unhelpful at any time up till the sale transaction. There's no point - we all know the prices can be outrageous, so thinking about cost can only make you feel bad.
Therefore a more healthy approach to these matters is to simply decide whether or not you want something. Then you just get it, hand over your dollars, and enjoy it. Don't think "That was such a rip-off". Think "I love driving my ML".
I gave the 3rd row seats as an example of gouging. There's no way I would pay that much for new seats, but here in Australia, the 100% markup on the retail price of anything you could buy in the US or Europe is standard at all dealers.
I pity the MB owners who would actually pay for dealer-fitted seats, when I know that the dealer cost is a lot less than US$3300, and then they have the nerve to hit you up for an extra US$3300 of pure profit.
Thanks very much for the offer Alex, but I have already acquired 3rd-row seats from ebay. Only cost US$1076 plus shipping. Then I got gouged by my customs department for another US$600! If they had pointed a gun at me it would have felt more like a proper robbery.
It's hard to forget these experiences but I focus on the money I saved, and enjoy carrying around extra friends whenever possible.
I hope that clears it up. You don't need to have 3rd row seats just to get the cupholders, but there's no point having the latter without the former.
P.S. That currency conversion was backwards. AU$8000 = US$6600.