Maybe this is old news to Forum users, I apologize if that's the case. Attached is a memo and two pics of an alternate fuel valve configuration for the Comanche w/tip tanks. Sierra Hotel @ KSGS is able to do a PMA install using Cessna valves. If the demand warrants, Chris G. at SH would consider pursuing an STC for our birds. I don't know yet what the cost would be, as I'm waiting on a quote, but his team does exceptional work. Give him a ring if you're interested in his product.
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P.S. Osborne sells the stock valve new today for $285.00 + shipping.