I fitted a Spal 11 inch sucker fan behind the rad on my Vitesse,very thin and works well,you might be able to see it in my avatar,
Close but it just clears the crank pulley.its switched by a thermo switch from Rally Design fitted in the top hose with an override switch in the car.
Biggest test was crawling up the M6 last August for 6 hours,guage never reads more than 3/4.
Steve