I bought a spare main companionway hatch, companionway drop boards (3 board design) and all the cockpit and foredeck hatches from an early Helms 25 like yours that was being cut up for trash. I have a pop up, so the companionway hatch doesn't fit mine. If your interested I have them for sale on Craigslist. classifieds - craigslist
I figured these would be almost impossible items to replace.
Rehoboth Bay/Indian River, DE
S/Y KJ, Helms 25