The thing you need to be careful of when changing to a LED turn signal bulb is the length. The depth of the turn signal housing is very shallow so a typical LED bulb wont work.
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I ended up using these
https://www.amazon.com/LASFIT-12-24V-Extremely-Non-Polarity-Blinker/dp/B077T8G9PG/ref=sr_1_1?s=automotive&ie=UTF8&qid=1522326368&sr=1-1&keywords=Lasfit+1157AI had to heavily modify them tho (in NO WAY plug n play).
I unsoldered the two pins on the bottom (run/signal input) then separated the brass base/can from the aluminum " bulb".
These have a LED driver inside the brass base/can which I remounted to the underside of the reflector (after extending the wires & incapsulating in heat shrink. CATION:It's a tight fit).
I had to grind down the O.D. of the aluminum bulb at its base so it would fit into the socket of the reflector.
When compleated, the top of the bulb doesn't stand any taller then the original glass one and the top is semi pointy (tapered) like the original (& Un-like the flat/wide top of a conventional LED tower).
These are 1157 type so they are dual output.
The output lum's appear to be as bright (if not slightly brighter) as the stock bulb so I'm happy with them.
I tapped into the supplementary running headlight running light circuit & ran an additional wire to each of the front turn signal pods to power the low lum input (run light) of the bulbs.
NOTE: I only put these in the front as Amber running lights are not legal in the rear.
I could use a red version but Amber is the safest color to use for turn indicators.
In the future, I may install these to the rear
http://www.hightechspeed.com/products/xarc/index.html in duel color so I can have red low lum for running, hi lum for stop, & Amber for turn indication.
(Presumably the Amber will dominate the other modes thus give a clear turn indication).