Yes, they more or less are. Both have two filaments, one for the parking light, and one for the brake light or turn signal. The parking light filament of the 3157 is a little brighter than the parking light filament of the 3057. The signal filaments of both bulbs are the same brightness.
Yes, the 3047 replaces the 3057.
Well. I work at NAPA and it called for a 3057kx which we naturally don't have in stock. But when the customer pulled the bulb out it was a 3157. which will fit in its place. It might be some sort of long life bulb. Just put a 3157 in there. that's what most brake lights are.
Yes, the 4157 is just slightly more powerful than the 3157, 28.5w compared to 27w
tail/stop/turn signal bulb # 3057 park/turn signal bulb # 3157NA
According to the 2000 Ford Windstar Owner Guide : The front park / turn lamps take the ( 3157 NAK , amber bulb )
Double-check me on this that the rear turn signal uses the brake bulb. That bulb is a 3057. See sources and related links below for more info.
For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)
The number needed should be in your manual, if not, remove the bulb & there should be a number on the base. When you go to a parts store, just look for the same number.
The 3157 is a clear bulb and the 3157NA is an amber color.
It's a 3157 bulb... dual filament, EXTREMELY common for this application among several auto manufacturers.
You need a T-15 star bit driver that is referred to as TORX. On the top and bottom of tail light are the screws. Carefully remove the chrome trim then the light pulls out after applying slight upward pressure. Once you twist out the socket the bulb simply unplugs. It should be either a 3057 or 3157 bulb. (i cant remember for sure)
The correct size is 3057.