Don -
Don't know how close to Long Island you are, but check with the Canvas Store in Huntington, NY. They did mine on my 33. Came to the boat and measured for everything, then came back and installed. They might already have the numbers for your H-27. Canvas Store, The Boat covers, tops and upholstery 11 Mill Dam Rd., Huntington (Hunt)...........................................................................Tel: 631-549-0970
