carver makes a boat cover for boats with t-tops, i have sold 3 to my triumph customers
with t-tops and seemed to fit pretty well, the number is 9021sd, or 9022sd, they have a zipperes entry on both sides, and have a hook and loop sleeve for vhf antennas and
run around 650-700 dollars, most any boat shop should be able to order one for you. land n sea carries them