They'er regular 2-filament 1157 bulbs. You may have to replace both of them- sometimes there is a big enough difference in resistance (or wattage) between brands, that the "bulb out" light still stays on. This happens more with headlights but the brake lights are subject to it as well. Make sure to clean the contacts of the socket, and note whether there's one white socket and one black socket.
--
Rob Bareiss, New London CT ::: 86 244DL, 87 244DL, 88 744GLE, 91 244: 808K total

The original equipment bulbs had a silver base rather than a brass base like most domestic car bulbs. Advance Auto has them; I think Sylvania makes the ones they carry. Right on the rack with all the other bulbs. More expensive then the brass based bulbs, of course. Check which kind you have in there already and get the same base type (brass or silver); mixing them often causes the bulb failure light to glow.

Mike Brown
Greenville, NC
1996 965 92K
1986 244 136K