This ECM is for the 81-82 Devilles,Eldorado,Sevilles,and Fleetwoods with the 368ci (6.0l)DFI engine.It is the 4760 1st model. The second model being the 5120.It ran my Fleetwood just fine while I was getting my 2nd model rebuilt, the only thing different is I had to do without the Diagnostics with the 4760 installed.Let me know if you need the prom and Calpac chips with it. I am asking $200 and you pay to ship. Paypal works for me. I am in British Cloumbia, Can.