Right Hand Drive '69 Barracuda

I just nipped out and test fitted that intake pipe oh my lord… Brent has the pictures, does anyone know if it’s posssible to buy 5" OD aluminum elbows, I need a 90 degree one, then the final part is a 5" to 6" adapter so I can fit the K+N airfilter on the end and while I think about it I;m going to need some rubber couplings to hold all of this lot together, I’m not sure the 1" blue painter’s tape will work for long!