I have very good S2 or early S3 spider tank. $95.00 plus shipping. Would need to see photo of yours to verify correctness, or I can supply photo of mine for your comparison. Have late S3 tank available as well.
I went ahead an got one from IAP and it is great. Even has the baffle on the bottom, right fittings, very well constructed. Since we tell them when they screw up also should tell them when they done good, you done good, thanks.