Did K-10s have different brake options?

[T-roy K10]

Just bought a set of wheels and tires for my 85 K-10 and they hit the brake rotors. They’re pretty much the same offset as the factory wheels that are on there. They are US Mag Indy series in 15x9 with -12 offset. cant Find any info on their site but a different site says they fit. So, I was wondering if I have a larger brake set-up.
it has a 10 bolt front axle and 12 bolt rear.
also when I was at the title transfer they told me they thought this truck was originally bought by the military or wildlife and fisheries.

 

[CalSgt]

I believe they’re a few different rear drum sizes for the half ton axles but I thought all the disk fronts were the same for the GM 10 bolt and Dana 44 on the half ton.

 

[Keith Seymore]

All the same in terms of rotors and calipers.

My guess is someone at US Mag didn't do their homework very well.

K

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[nvrenuf]

Just to say it out loud, an 85 truck wouldn’t have had a 12 bolt rear, the rear axle should be a 10 bolt. It’s not your issue but at least some of your drivetrain isn’t original.