Fender Mounted Turn Signal Indicator

I have a 75 Plymouth Scamp /6 225/904/7.25. All of the lights and directionals work except the drivers side fender mounted signal. It had a 194 bulb in it. The owners manual said 168. I tried one of them. I've rotated how they were plugged in. I replaced the connector/pigtail that has the bulb, gasket and conects with a male plug to the regular turn signal. The fender mounted indicator lights up but does not blink. The package with the new pigtail said to use an 1157 bulb (I thought those were bigger).

Any suggestions or advice?

Thank you, Jim