Scrappy-
I think that the four point is better than the 4, if you have the option to go to a four, go for it. I have two tanks for sale, 10 gal each. One is in perfect shape, the other needs some welding. Someone cut the old fill tube off it and screwed in a new flanged fill tube with about 10-15 screws holding it in. I think they are aluminum. Make me an offer. I can get pics if you want...Where are you located?