Help!!! Brakes

Okay I have a 89' S-10 Blazer V-6 4.3liter and I have had a break problem, it’s with the bolts that hold the caliper on. On the passenger side both the bolts are striped. I originally only had one striped the bottom bolt ( there are 2) I went to napa bought a new tapping bolt with cotter pin put it worked fine after a while the other bolt striped out so now both are and the one that was first to strip out is even worse now...to the point were you can hand tighten it, both have been replaced with the re tapping bolt from napa I really need to know what I should do and keep it as cheap as I can. Do I replace the piece that it threads into which to me looks like a part of the frame of the car or do I bolt it in with a conventional regular nut and bolt if I have proper clearance?? Here is two diagrams so you can see what I am trying to describe...just need some ideas or answers thanks.

Diagrams:

Fig #1

1. This is the bolt at that end is where it threads in an tightens that is were it is striped

2. This si the metal. piece of the car or frame

Fig # 2 ( This is a reverse look)

1. This is the metal piece that the bolt screws into it’s like a flange that is bolted as noted in this PIC to the frame of the car where the bolt goes into it and tightens to hold the caliper is striped. How to fix that??? is the question hope the visuals help.

Link for Diagrams :http://community.webshots.com/album/277869901iHWfXB

Go to a wrecking yard and get a new knuckle... This way you're not doing it half assed.