No, I don't think so
I have a pair of the tanks on my RV-6A and they are excellent, providing 17 gallons of additional fuel. When I bought my kit in 1996 I rented a Budget truck in Portland and drove it home to Orange County, California. On the way I picked up my tanks at the airport in Grants Pass, Oregon. Others have tried to get these in recent years without success. Farn Reed sold them for several years but when I tried to help locate him with an inquiry of his wereabouts in this forum I was told that he was killed in an aircraft accident. If anyone had picked up production I'm sure it would have come out in the forum by now.