Thanks a lot, will check to see if I can use the foam in places suggested although I'm dubious about it being next to hot radiator but if it supposedly goes on the core for the 850 I guess it is ok.

Seems the body of the core on the outlet side of the Nissens is not as thick as the nice metal one I took out so the strap is not fitting the same. My solution is to bend the strap so it bows toward the body of the core so that it holds better but still troubleshooting if this will rattle or not maybe good place to use the foam dunno.

Also seems like a good idea to hook up the core and warm the car to make sure its ok before putting everything back again. Thanks again.