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Caspian makes a "classic" frame with the original contours, little over $200. If you can import them, probably cheaper/better than finding an original.
I mentioned Caspian as the OP stated "not A1" style frame. Yes its going to be more expensive, but for a Savage slide, maybe worth going the extra mile. Not sure if there are other current manufactured pre-a1 style pistols other than the Colt repros....
An original would be best, but might be hard to find as well.
Talk to Jo at Dlask - I believe that they start with blanks, he might be able to machine a 1911 spec frame from a blank for you. That way you'd get a nice tight fit, as he could leave a touch extra on the rails for lapping.