Clutch Fan application

[169indy]

Wondering what application the following fan would be used for?
19.25"OD
GM 3999260
7 Blade
3 rivet per
Blade PN 915054D73

I would assume 1973 due to the D73 on each blade, but unsure as to what vehicle-eng comb's? Truck, Big car,,etc..

Thanks,
Jim http://www.yenko.net/ubbthreads/images/graemlins/laugh.gif