W123 300D AC Heater Servo

I have discovered a small crack on the top of my 1979 300D AC/Heater servo, which I believe is the source of all my various vacuum and a/c vent flap issues. What I do not know is where one can find these
rebuilt. I know that they are available as an OEM new part at around $1,200, but am also told that a rebuilt version is available.
Any information will be greatly appreciated.
(BTW, this is the unit that sits just behind the passenger-side headlight, and is covered by the air cleaner intake hose, which is why it took me so long to notice the crack in the case.)
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http://heaterservos.com/index.html
$499 with lifetime warranty and aluminum housing... fully rebuilt.
I will look for used one too... of any better deal...
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Thanks for this--exactly what I was looking for. Much better that the $1,800+ shipping for an OEM one.
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I don't know why I didn't look on eBay, but one reason is that when I initially discovered the problem, I was not exactly sure what the technical name of the part was. At any rate, many many thanks for going to the trouble to find all these options for me. I had one guy here locally assure me that this was a "$2,000 part"!
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http://cgi.ebay.com/ebaymotors/Mercedes-107-116-123-rebuilt-climate-control-servo-/140441998878?pt=Motors_Car_Truck_Parts_Accessories
He is $379 plus shipping... he will refund you $70 for your cracked core. so that brings you down to $309.
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http://cgi.ebay.com/ebaymotors/Mercedes-Rebuilt-123-Heater-Control-Servo-240D-300-D-TD-/380258950818?pt=Motors_Car_Truck_Parts_Accessories
$349 with aluminum housing. rebuilt...
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I bought one of the remanufactured aluminum ones from Performance Analysis in TN a long time ago, maybe 8 years. It also had a lifetime guarantee where they will replace it if it fails for $100. I think I paid $400 for it. The first one started leaking in a month or so. They replaced it and that one is still working many years later. However, about a year ago it too started leaking, but it's such a slow leak that right now it's easier to just put in a quart of coolant twice a year. I wonder if the company is still around to honor my warranty. But, even if they are not, for as long as it lasted it was a good deal. These servos, especially the all plastic ones have a high failure rate. The aluminum bottom housing eliminates one main failure mode, which is to crack and start leaking. But there are plenty of other failure modes.
If mine failed, I'd go with one of them again. The other choice is there is a company that offers a kit that eliminates both the servo and the amp. It's microprocessor based and converts the whole thing to a much simpler and hopefully reliable design. I think it was like $800. If you google in this newsgroup for "servo" or "climate control" you should be able to find the info.
One thing I would NOT do is buy a used one.
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wrote:

Thanks very much. I am leaning toward the rebuilt with aluminum case. I have been told never to attempt a used one as they always fail right away.
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http://www.performanceproducts4benz.com/mercedes-air-condition-digital-servo-upgrade-unit-107-116-123-chassis.html?dept_idU30
$699
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http://unwiredtools.com/accii.asp
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Wow. Very impressive statements in this description. I think for a few hundred more, this is the way to go.
Many thanks!
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