Sue, We are also on a '73 41OI,- The material has been delivered to my daughter's home and I'm driving up tomorrow to pick up a small sample to fit one portlight. I want to see if the flexibility is sufficient to make the 3" radius turn at the ends of the ports. Unlike the original the locking strips are black. I hope that the current product by Stanlock is identical to their 1973 production. Send me a reminder e.mail at
aythya1@yahoo.com and I will tell you of my findings. I recall the name of your vessel,- maybe on the morgan 41 yahoo site...?? 'take care and joy, Aythya crew
(google Stanlock sealing gaskets to see the specs for the 1" to 1/4" gasket)