There is a write-up in the Toyota section of off-road.com on how to convert the corner/parking lights to do double-duty as parking lights and turn signals. I did the same mod to my Tacoma when I got rid of the stock bumper and turn signals. I used a Ford socket and did not have a fast blinking problem until the bulb kept popping out. Afterward, I got some 18-wheeler turn signals for $8 each at a truck stop and used CB mounting brackets to bolt them onto a spot where the stock bumper brackets used to bolt to. Unfortunately, they blink fast for some reason using the trucker turn signals, but they work perfectly fine otherwise.
Hope this helps. Take care,
Ed Q.
Ed Q.