I bought my lens there also. They have them in clear or tented.You can order online at the link Claude gave if you have an ‘83 - ‘87 Hunter 31 these are your ports you can buy parts or the whole port. Not sure if they are working now. Try an email, I have found them to be most helpful. I am slowly replacing my ports an have ordered four from them so far.
Ports- Gray Enterprises
Odd port 14.75 x 4.75 Size 414
All others 12.5 x 5.75 size 512