194 and 168 are the same exact bulbs. 158, 161, 168, 906, 912, 921, 922, 2825, and 2821 are also the same as the 194 and 168.Ron Helmuth said:a 194 bulb will work for a side marker but not sure if that is the recommended bulb.
I believe a 168 bulb will work as well. Pull out your burned out one and take it to the store-they will recognize it. Also they will have a book or computerized kiosk to tell you the correct bulb to buy.
Go OU Bobcats!