Spacer size help

[sir_talk_alot]

I got a deal today on a set of 6lug wheels that are 6x5 off a trailblazer for 275 with tires. He bought the truck and didnt think his daughter needed flashy rims.
The wheels are 18x8.5. From what i measured it has a 5.75 backspacing and using a chart came to +25 offset. What size adapter/spacer should i run to avoid rubbing and not stick out of the fender well. They make 1.3" 1.8" 2". Roadkill enterprizes makes a solid adapter from 6x5.5 to 6.5. I have a full drum truck. Thanks
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