Keep looking for a used harness. When my son's 351 Windsor caught fire (alternator) Ford wanted $1,000 for the engine compartment harness and another $400 for the injector harness. We got them both at the salvage yard for $150. I know the SDL is not as common as a Ford but someone will have it.

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Brian
87 300Dturbo 180K #14 head still running R-12 SOLD 12/2017
02 F350 Powerstroke 180K
05 Chevy Express 1 ton w/Royal Utility box 120K
08 Infiniti FX-35 40K
15 Golf Sportwagen TDI 35K
10 Sprinter 3500 chassis with a Class A Winnebago on it. 56K