Is this aftermarket Blazer roll bar?
 

I know this isn't a factory one. The guy I purchased it from didn't remember what he removed it from but he had parted out a few first generation Blazers. I have a 72 short bed but don't have a blazer to check this in

Re: Is this aftermarket Blazer roll bar?
 

Just a guess but it doesn’t look to me that it would fit. All first gen roll bars are aftermarket, GM never made one for this application.

Re: Is this aftermarket Blazer roll bar?
 

That roll bar wont fit a Blazer as the rear bars will interfeer with the whell tubs. That looks like a pickup bar.

Re: Is this aftermarket Blazer roll bar?
 

Blazer roll bars are shorter on the back side (the brace). They mount on the wheel tub.