This BAS Porsche 911 style cooling shroud is modeled after an original 911 fan shroud. Knowing this I wanted to try and install the alternator air deflector.
The aftermarked alternator in the 240mm. fanhousing sticks out 1 cm. more out of the back compared to an original 911 alternator. I had to cut some material from the fiberglass cone around the mouting points and trim the vanes a few mm. but now it fits perfectly
I used two M6 10mm. nuts the first to hold the cone in place and the second to lock the first one in its place. I've done this not to overtighten and crack the cone. Ebay is full of those.