M & H....Best in the market for my $.02.
http://www.wiringharness.com/
Products>Wiring Harness>Chevy Truck Catalog
Pages 11 or 12, depending upon what you have.
I'm using part 33915 on RAT.
Have used 'em before on the '72. Will use 'em again.
You can call and talk to a real person...Or just order with confidence.
No "connection" to me..Except the good ones under the dash...
...and all over the truck(s).