I don't want to mislead you, as I don't know if the dimensions from year to year vary with the years on Gals, but I've heard 1995-2001 repeatedly. If it were me, I'd grab the ol' tape measure, draw-out your basic Gal dimensions, and spend a some time at the local wreckers. Sometimes there's an option that's better due to mounting points or shape that others haven't heard about - including other brands. I''ll bet a New Yorker or a Corsica would be worth a look. But, maybe not. I guess my point is that there are lots of things folks have found to work for a purpose, but that doesn't mean it is actually the best available option - at least for you.
David