since no one else is chimin in, ill give it a go.
the '05 mount has more gap between it and the outside of the shell for better clearence and i think it was rotated some clearin up 2 issues with the 1st draft. there might be more to it than this.
the new rfx has '05 mounts.
unless yer goin with a single ring, id suggest a e type. less likelyhood of breakin or bendin the crap out of it than usein a hard mount system.
the '05 mount has more gap between it and the outside of the shell for better clearence and i think it was rotated some clearin up 2 issues with the 1st draft. there might be more to it than this.
the new rfx has '05 mounts.
unless yer goin with a single ring, id suggest a e type. less likelyhood of breakin or bendin the crap out of it than usein a hard mount system.