I need a new SLS valve for my 81 300td (w123 wagon), but am having a hard time sourcing one. (Have fluid flow to resovoir and no system leaks but no ride height adjustments are made by the system.) Rebuilding my current valve is an option but I am worried about messing it up and then having the car be immobile while I wait for additional parts. The part number for the correct valve is 1233200158. I can only source used valves with the part number 1233200258 (it is more rounded rather than a square unit), which I am assuming is for the w124 wagon and various other newer models. Is it possible to use this newer valve on a w123 wagon? Has anyone here tried it?

Edit:

Here is the link to the 0258 part that I am thinking of purchasing to try on my w123 wagon.

http://cgi.ebay.com/ebaymotors/Mercedes-300TD-560-190E-2-3-16-self-leveling-valve-SLS_W0QQcmdZViewItemQQcategoryZ42609QQitemZ7958367167QQrdZ1QQsspagenameZWDVW

Thanks,
Glenn