Blower / heater / windowheater

[Racelook]

I didn't know where to put it so I put it here.

I'm on the restauration of a 1303S which will get one-piece- windows so there will be now ventilation through the small ventingwindows in the doors.

Because i want to get rid of the allways verry rusty "windowwiperbox" (you can see it in the inside of the trunk) I want to weld the ventilationinlets closed (they are before the frontwindow (in the middle)).
Now is my question: have someone done this ever.. and which blower / windowheater dut you use??

Or does someone know if i can use a blower / windowheater from anonther brand of car?? Idon't care if it dont fit in the original box.. (it is so rusty that i have totlaly grinded away)

If someone know other soulutions please let me know... I nead it to go further with my restauration..

Thanking you in advance.. (yeah yeah.,.. i have looked up this in a dictionary)
WIebrand