I had that problem with the flashers as well mv70.
So for now I am leaving the original blubs in the flasher housing. And just using them in the brake housing. They work great.
Aside from that Etrage LEDS are very nice I have the gauge set as well.
Another member posted this
http://forums.pelicanparts.com/porsche-911-technical-forum/779096-led-conversion.html
However, I also wonder if LEDS front and rear would remedy the issue.