I am also looking to replace the run flats on my '06 SC430. There are a lot of useful recommendations to choose from. For those that have made the switch, I have a question. What about the spare tire issue? Not worry about, get the 12v air compressor and a can of tire sealer? The spare tire kit from the dealer is now (1-14-08) $900, which includes everything color-coordinated in Lexus fashion. The same dealer can get the spare rim for $135 and the donut tire for $150. A jack form Pep Boys for $40 should complete the set.
Any feedback on these options?
Rand