IMHO you will have no choice but to go poly! I would not consider aftermaket rubber ; it IME does not last as long as the stuff from Ford. You could go New Old Stock but how long have they been sat on a shelf? The fronts are out there in the NOS form but I really struggled with the rears.

Up front I would get them from SuperFlex or possible SuperPro (Both use alot of the same parts,although Chris@SuperFlex has started to use some of his own). They/both are about the only poly bush company I know of who put some thought into the design of their bushes and materials. They are about the only poly bush I have had on a car with good location and with improved comfort over stock. Not something you hear about poly bushes everyday . That is from a few cars too, including my old MGB with leaf springs on the rear (that was a near revelation on the rear end!) and on a fully rebuilt Triumph 2.5 PI ; I have not been in a Triumph since that was as poised, tight or comfortable to drive as that despite forums saying 15" wheels ruin ride quality etc.

On the rear you have no choice but to go with Floflex from what I can tell. Superflex did say they would make some but that they would need the numbers to be right to make it worthwhile - When I enquired about buying the rods from him to make one myself he was saying that I could not account for crush loads and initial loads etc. on the bush by simply mocking one up from the original.