Off my 86 big block burb. Should fit big block blazers and trucks of simular years. Not sure what the 3 holes at the bottom are for...PO put'em their. Up for offers on this one....the buyer I was dealing with is not getting back with me so I'm post'en it here. Shipping will run around $27 1/2 bucks...it's oversized....like the pics All mounting tabs are their.