Re: bulb size for front JEtta turn signals? (Mike VR6)
For the front signals on the Jetta, you can use any of the 3000 or 4000 series wedge base lamps without the NA suffix (for a clear lamp). This includes 3057, 3157, 3357, 3457 (stock on the Jetta), and the newer 4000's which are extended service.
Be sure to replace in pairs with the same bulb to maintain balance.