[Stocker]

Glad to help and here's a bit more minor info about that clutch unit. If you buy from NAPA, their part number is 271303. You can see it on their website. It comes with a [water pump] pilot bushing that you probably need to use. I needed it on mine.

My 18" 7-blade fan is original to my factory A/C truck, as is the shroud. Don't know if it has numbers on it and the truck is still in the body shop an hour away. Not even sure what the shroud diameter is but I'd guess at least 20", maybe 21". As I recall there's about an inch of clearance between the shroud and the tips of the fan blades. Oh one more thing, my fan blades are not all evenly spaced apart, which I assume is for quieter operation.