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????? You couldn't go to a Mazda dealer and order an '82 with 20mm lower mounts, nor could you have gone to a dealer and ordered an '85 with 20mm higher mounts.
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No, but you couln't go to the dealer in 81 and get an 85 carb either. Or vice versa. Nor can RX3 dealers sell you a 74 with a 77 transmission. But as they are all on the same spec line, as long as you aren't creating an assembly that never existed, (like swapping gear ratios) I don't see why you can't do this..