12 blade 964 fan question

[itHaKa]

Hi Guys

I bought a 12 blade 911 964 fan housing and alternator, i also have a type 1 engine, i already have the 11 blade fan, but found this is a little bigger

i´ve seen other 12 blade fans but i think they are aftermarket "Style" fan , smaller than this .

i would like to know if has any of you installed a 12 blade fan on a type one engine , if so what is the kit ( Shroud ) will fit ?