I would guess he wants to use the serpentine belt, pulleys from the magnum. So, to keep it simple, he wants to know if the fan will work from the magnum also, that way it works with the current pulley system on the magnum. This is my guess of what he wants to know......?......
I measured my magnum flex fan once and I think it was 20''. I think the la's were like 18. while I DO NOT recommend this, so far iv'e not run hot at all without a shroud, not even at red lights and a/c running. of course it's not summer hot right now either. will likely go with elec. fan next summer. dave.
The big 11 blade fans sound like an aircraft is taking off. It's way too loud. Look for the smaller 5 blade fan. It's still huge, and will move massive amounts of air through the radiator.