[hugger6933]

Now some things to keep in mind, the brackets from the 88-89 truck were huge and made of metal, they are functional but I wouldn't think very desirable.Now on the trucks there are two different types [not including the metal] the ones that most people are showing and what most talk about are the one from the model years 90[late 89]-95. In model year 96 when the vortec motor was introduced[ small block type with GREAT heads]the bracketry changed and the A/C compressor went to the drivers side top and the ALT went to the pass side top. Now there was a lot of problems with that type of A/C compressor as it was pressed together and once the mounting bolts were loosened it would cause the O-rings that were in the pressed area to leak and you then would lose your cool[literally and figuratively].
As said by the above poster the S-truck had the same alloy bracketry on them in the 89 model year the 4.3 motor was introduced in the mid year of 88 and that made the 88 model a long run and did the grille change and other redesigns in the 91 model year witch was 18 months long.
Now there were 2 4.3's to be had in the S-10 mostly Blazer the TBI Z vin is what was in the full sized trucks and the HO [looked kinda like a tune port motor] was a W vin. Those bracket differed slightly but will still fill the bill looking for a serp set up to put on an older small block.
the S truck also changed the bracket in the model year 96 with its Vortec release [different intake and dist set up] not to be confused with the older tune port looking vortec from years past. it [the later vortec had the pass side alt and driver side A/C set up like the truck.
Also know this when going to a serp set up you NEED the fan and clutch and water pump to keep things happy as they are all backwards flow and you WILL over heat if you don't go that way.
If you have power steering already, you will have to change out the pump too as the shaft on the serp setup is a little bigger than the old style with the nut on the pump and you need the press on type pump to work properly. I hope this little snip it of info is found useful by someone if nothing more than sleep aid. Jim