I ordered 6 blocks of 6061-T6511 aluminum size 1.5" x 2.5" x 5" from Speedy Metals, got them and a machine shop locally is making the handles.
I have enough material for 6 top and lower handles and the cost is $35 each pair. I am posting
this in case others with the same Goiot hatches had the same troubles as I did.
Thank you for your suggestion Rich (Cabo Sailor) !!