Here is a webpage I have on my site concerning the '91 Suburban grill change.
http://www.geocities.com/abetterchem...rillchnge.html
Major differences are the radiator support, lights and grill pieces. The fenders are the same except for the passenger side. This side has the carb intake fitted in the middle. If you need to keep your truck street legal by using the factory air inlet then you will also need the factory air cleaner and duct. Mine cost about <$500 with all new parts. Dealer parts will cost you well over $1200.00!!! How did I do it? Call your local body shops and find out where they buy their parts. The parts will not be factory pieces but close enough that I like mine. The most expensive part is the radiator support ($95.00). Check your phone book for a place call Parts Net. They sell parts to all the local body shops in my area. I like them because they sell to the public too!! Sure can save you a ton of money.
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Gerardo
1983 Custom Truck
TX Plates: "BAD BOW"
http://www.geocities.com/abetterchemist/