Hatch covers replacement on beachcats

Anyone know who sells good solid replacement hatch covers . The last ones I purchased were too flexible and were a real pain to remove cover and then screw back in . The original ones were a hard plastic and worked a lot better.
I bought from Murrays.com in CA.

--
Sheet In!
Bob
_/)_____/)_/)____/)____/)_____/)/)__________/)__
Prindle 18-2 #244 "Wakizashi"
Prindle 16 #3690 "Pegasus" Sold (sigh)
AZ Multihull Fleet 42 member
(Way) Past Commodore of Prindle Fleet 14
Arizona, USA
--