bigd65,
The web site below gives details on converting '73 to '80 trucks to the '89 - '91 front end. A parts list is also listed for the '81 - to '87 trucks.
http://www.coloradok5.com/grilleswap.shtml
Visit my web site for details on my truck's conversion to the quad side by side headlights style. If you have a 700R4 tranny, I would recommend installing a transmission oil cooler during the swap. I bought most of the parts from aftermarket suppliers.
Only things I bought from the dealer are:
hex screws, grill bow tie, (the little plastic squares that the screws screw into, headlight adjustments screw asseblies and adjustments springs. The springs are hard to find in parts stores. The headlights screws can be found at major part stores.
Good Luck,
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gchemist
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/