2004 GMC Yukon XL Denali Rear Bumper Hardware Kit

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ExplodingSidewalk

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Trailer Hitch => Bumper (21mm Hex Bolts) (Qty 2) What is the correct bolt size? Length x Width x Thread?
Bumper => Bracket (17mm Hex Bolts / 17mm Nuts) (Qty 4) What is the correct bolt size? Length x Width x Thread?
Brace => Frame => Bracket (18mm Hex Bolts) (Qty 4) What is the correct bolt size? Length x Width x Thread?
Frame => Bracket (15mm Hex Bolt) (Qty 2) What is the correct bolt size? Length x Width x Thread?
Trailer Hitch => Frame => Bracket (21mm Hex Bolt) (Qty 2) What is the correct bolt size? Length x Width x Thread?

I'm looking to purchase new hardware for my new rear bumber / braces / brackets. Don't want to pay high prices on GMC Parts websites.

Thanks for all your help.
 

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