are these visible in direct sunlight? If you don't mind modifying the bulbs, you could get 1156 bulbs and file one pin down like I did since 1156 bulbs have more variety.
I have these in white and they are brighter than the stock bulbs in direct sunlight.
http://www.ebay.com/itm/2x-7-5W-LED-...s_Gear&vxp=mtr
You could check out the review I made on those bulbs.