Boy - I am not sure what kind of hatches they are.. No real marking on them
they look like old iron lol - but we both have 1981 they can't be too different I would imagine - almost twins!~
The glass has started to after many years to look a bit scrathed, so I suppose $500.00 investment would be worth it! But I have been really wanting to change the ports first!
I will have to take a picture when I go check on the boat this weekend.