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Sorry I don't have a good recommendation, but I can tell you one to avoid.
I did a refinish and used Duplicolor wheel clear that didn't last. After about a year it started to yellow, and by two years it started to crack and flake off.
How are you looking to apply? Rattle can or shooting with HVLP? Shooting with my Sata gun I've used Finish1 which is a high solids clear and holds up extremely well. There are many choices available and everybody has their own personal favorite. The one thing I would certainly recommend is that you avoid rattle can at all costs.