Need a good aftermarket bulb source

[NewfoundlandDude]

I tried to replace my rear turn signal lights with an aftermarket red bulb instead of the amber. It looked just like an 1156 with the single contact, but the two knobs that guide the bulb into the socket were offset. Instead of being at 180 degrees, it seemed to be at about 150. I think that the bulb is an 1156A instead of an 1156 according to sylvania.com. I called SportCompactOnly, and they have nothing. I googled it quickly, and can't seem to find much.

Who are some good bulb suppliers???