I spent some significant time trying to find one that would work without modding and no luck. I settled on the plastic 11 blade discussed above.Duramax fan is similarly sized to the TBSS 6.0L fan. The fan bolt pattern is the same between the TBSS and Duramax. The 6.0L severe duty clutch threads on a Vortec water pump. Not sure what clutch someone would use to marry it to the TBIs 4 stud arrangement.