The factory 4 pistons are nice. That's what's on my tundra. Look for 03-06 knuckles and just upgrade. Pads go in from the top of the caliper so no more drama
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I would suggest using at least a grade 8 bolt when going back. I dont think AZ have grade 8 stuff.?. Maybe NAPA or NOPIThat is what I am putting on. They are bolt-on ....provided you don't bust the bolt!
I found a torch head also. I going to heat it up good too.Dip everything in penetrating oil overnight before you start turning wrenches.