i pulled mine out to potentially do the same a few years ago. You may not find one that is an exact match. Mine had some decent odors that i was able to track down to a loose fitting and i also installed a Big O filter. If you start by pulling it, you can get it some good measurements. There are a bunch of universal tanks out there. You may need to drill holes for the fittings but the big thing to make sure it fits your location.
Measure yours up and look at the different sizes at any marine supplier did mine 2 years ago. Dimensions were not exact but I got one close to the size so I could put it back in its spot.
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Be sure to replace sanitary lines.10yr life expectancy before they start to stink too....