save yourself some money on the whole project first. i'll shut up about this website sometime but, same axle halves are $88.94 each from *********. parts are in stock and since you in austin, i'm guessing they have a nearby warehouse, all ground rate orders come next day if ordered before 3pm.

http://www.*********.com/catalog/1987/mercedes/300sdl/driveshaft_-ar-_axle/axle_assembly.html

i've heard both good and bad on these FEQ. bad, lasted a year and a half. good, over 40k miles in 2 years and everything is good. the nice thing about these axles is they can be worked on/replaced much easier because they can be separated at the differential end by removing alan bolts. that would cut repair time in half if one ever went bad.