Depending on water pump used (it changed somewhere in the M103.98 run), there are two possible lower hoses for your car. The nuerosurgeons moonlighting at Track Auto may have trouble with that, so double check them (engine ser. #. would determine which hose variation you need). Have you tried FastLane/PartShop overnight rates? Might still compare favorably with dealer prices.
The Golden Rule
1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)