I saw you get that white one, it looks a little banged up but it was cheap enough.
On topic-Remember the JS1000, like all Japanese Ibanez metal mounting rings have a curved radius on the top. So yes, they're flat on the bottom and matching neck to bridge. But Stew Mac and others are selling thicker metal rings now, and they're not the same. Ibanez is the only outlet for those special rings. (can you tell they're my favorite?) Actually my all time favorite are the contoured rings on some of the S-Classics. Anyway the JS 100 are the flat Korean ones.
Although old Radii had plastic rings that were taller on the bridge side, those were holdovers from the Roadstar days. They switched to metal rings during '88-'89 before the JS was introduced. So every Japanese JS had/has the arched metal rings.