We've been testing switchback LEDs from
iJDMTOY.COM (phone no.. 626-872-1127 ask for Rudy). These LEDs appear to work better than the ones we got from Kaizenmotor (they didn't last 3 weeks). The iJDMTOY LEDs have been in two cars almost 6 months and no failures yet.
I hope this helps.
Dave