Or if not at Wichita then take a road trip to the nearest big city boneyards with laundry list of fiddly bits you need. Junkyard pick'n pulls are great for grabbing buckets of parts. And you never know what you will find there, like maybe a complete set of cherry 114 coupe wooden dash pieces that will fit right into your 220 sedan. Other goodies you discover might include a complete set of original 114/115 Hella driving lights complete with wiring harness.

(edit: Its a myth that you will never find parts for the car. Consider the fact that bulk of items are interchangable among similar body style Benz's built over an 8 year span.