Call Jeff at Sonicap he carries many brands and will give good advice.
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I recently replaced all four coupling caps in my SLI-80 F1 after one of the original Jensens failed.
There are lots of options out there but my recommendation would be to contact John at The Audio Connection in Seattle. He's a Cary dealer and very knowledgeable about upgrade and repair work on Cary gear.
He replaced all the caps in the amp including replacing the coupling caps with Cardas Golden Ratio capacitors. They're no longer produced but he has a substantial stock of them. His repair work is very reasonably priced, making it cost-effective to pay the shipping to get the amp to him.
And, yes, the Cardas caps did sound better than the Jensens, which were themselves an upgrade from the stock SLI-80 caps.