It’s $59 for the exact right thing with a new seal that will last you 10+ years of worry free service I would just buy a new one I just got one about 4 months ago thI s is the best place to buy Porsche OEM parts and cheapest anyware guaranteed.
https://www.******************.com/oem-parts/porsche-fuel-filter-m37x1-5-for-porsche-924-928-944-959-964-968-and-993-92820108104
However if your getting a new tank then before you install just remove the sensing unit and swirl some clean fuel around in there to flush it then spray brake clean in the big sensing unit opening to clean strainer that’s inside new tank. You might be able to get away with cleaning it from inside and running it as not to risk stripping that one as well. Or my recommendation would be to have the dismantler who you buy new tank from take it out so it’s guaranteed to be ready for you to put new one in. I always put a dab of anti seez on the threads good luck