I believe in 92 Dodge extended the nose out to make more room for the V8. I think the fenders are the same 87-96, but the bumper & grill extend farther forward then the 87-91 grills. I suspect the rad support is likely different between the two series, but with a V6, the complete nose from the older trucks might bolt on to your truck. There might be wiring changes between the two series as well (not that that would matter to you), didn't the OB II come out around 92 or 93 as well? Gene