I noticed my 83 300SD has a double belt alternator,
which means double belt fan and a double belt on the crank pulley.

I would like to have the added insurance of double belts on my 80 300D.
The 300D only has single belt on each accessory.

It looks like a simple pulley swap from an SD 617 engine.

Anyone ever done this ? Anything to watch out for ?
Anyone want to sell me the three pulleys I'll need (crank, water pump, alternator).

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250