Duro makes very nice 27X1-1/4" whitewalls. Rated 75 PSI, but I dare say that it could go to 85 on a hooked rim - these things have a damn big bead.
You can get them via your local "Lowrider Company" dealer (essentially, the F&R Co.), or I might be able to special-order you a set from my dealer.
Take care,
-Kurt
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