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All the variable modulators I have found have been UHF only.
The only differences I'm aware of in the channel allocations was when they stopped using channels 0,3,4 and 5. Unless you've somehow ended up with a set that only has those biscuits fitted to it's tuner you should able able to find something that lines up.
Another option would be to feed it with IF, either straight from the modulator (many modulators intended for headend installation have an IF output, but you won't find it on consumer gear) or from another tuner.
The tuners used in most 90s sets are fairly simply to drive and the pinout is often marked on the board.
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