You can simply change your vehicles wiring loom's plastic connector shell to a 5 pin style and use the 5 Pin module, takes a minute or two!

If you decide you need a different module I have both 4 and five pin modules available for $30 shipped USPS Priority you can have one in 2-3 days. additional modules are $25 each, I've got 126 modules also.

The 5 pin connector shell is MB # 013 545 32 28, virtually every 124 car and 201 cars have a power distribution block on the driver's side, left hand side foot well behind the plastic trim, there will be at least two or three circuits that connect there which use this 5 pin inline connector shell. So if you have access to any 210 or 124 parts car that's where you can get this connector shell easily.