Turn signal bulb replacement?

[Zilla500]

I bought my 1994 GS500 used, and I don't know if it has the original turn signals or not. The right front one burned out and am looking for a replacement one. The Clymer manual says its a 12V/21W bulb - fair 'nuf. However, I go to Advance Auto or Autozone and can't find a matching one, where the "nipples" (the parts that hold the bulb in place in its socket) are not directly across each other on the bulb's circumference, but are offset; all the ones in the store have the nipples directly across from each other. The markings on it are faded so I can't post the part number. Where can I get a replacement, or should the ones from the store work?

[Zilla500]

Here's a pic.