i've seen only one blazer frame under something & it was a 4x4 that a guy was putting under an early 50's suburban. BUT that doesnt mean ya can use them. BUT i would think because of the width of the frame about the only thing u'd be able to put it under would be a P/U body & it may work under just about anything from the late 30's to the mid 50's or later. take a tape measure to the frame, side to side, front to back & got from there. remember u can shorten or lenghten the fram also....joe