check out this thread. not sure if this would be better.
http://www.toymods.org.au/msgboard/index.php?t=msg &th=13167&start=0&rid=1808&S=5fcff be343ba7539f32977c9ccc31dd6
oh yeah one more thing, I think the 22RE dizzy is a bit bigger then the 18rg. I mean the housing and cap have a bigger circumference. not sure if this would cause a problem, but it might mean that the insides would be bigger to and not fit into the 18rg's. like I said I'm not all that sure. I've spent too much time at the wreckers lately