Went through cooling system after purchase of D2 with under 100k miles a bit over 2 years ago. Came here and read of many potential issues prior to purchase and most of my maintenance/replacements just time change/precautionary. Recommendation at the time was to use that fan blade/clutch, like the blade being shrouded for safety if working on the engine when running and more like OEM. No difference noted as original assemble was probably working as advertised. Summer in the city idle in traffic about 195 F max.
Doubt much different performance between Dorman blade and OEM type except one's less expensive.
......

 

Here's a side by side picture before I changed it.

 

And you'll need 4 bolts to put the fan on the fan clutch, I forget what size they were.
There are none to swap over from the stock fan either, as stock fan and clutch are one piece.

 

So what percent of air would you say this new fan moves in regard to the old one. Like I've heard as much as 40% increased!

 

I couldn't honestly say.
I replaced it along with alot of other parts...to stop the tick...which I didn't. So now I'm taking the engine out to pin all 8 liners and check /replace the flexplate. Apparently they tick too if they get stress cracks.
Fortunately, my engine didn't run hot to start with.
But, at 13/14 years and 122k miles, for $62, I figured it was good insurance.
The fan fits well in the shroud too, no clearance issues at all. It is a little wider, but a slightly smaller diameter than stock.
Sorry I have no before and after temps. I bought a ScanGage also, but not til after the new fan.