Well...
They will definately fit if that helps?

Genuine Ford Cosworth rings are a far better material and like you say the AE ones you ahve there are available from any engine machine shop or bearing supplier for about £35.

Same goes for bearings, pinto bearings will fit the crank etc... this is why some folk can undercut us on engines by quite a margin. Too many pinto parts fit

Incidentally, the INA lifters were modified for the later Cosworths to help with sustained RPM and the VW ones everyone buys cheap are NOT the same ones you will get from FORD