Drive up to Shoreline. Go visit Doug at the Camera Clinic. He has tons of the AI style prongs. Partly because I take them off whatever factory AI'd Nikkor I get and reinstall the old style prongs.
His hours are 10 am - 2 pm Tuesday-Saturday, so it might work better if you go Saturday. Take Exit 175 off I-5, then continue straight north on 5th Ave NE until you hit NE 165th. Park in the parking lot next to the 7-11 on the northeast corner, then walk about three storefronts to the east, and you'll be in front of his shop.
His phone is 206-367-2440.