Need more info. on your car..
NORMALLY YOU CAN REUSE YOUR OLD GASKET THAT COME WITH YOUR ORGINAL OF YOUR CAR... 99% THE OLD GASKET IS STILL GOOD... WHEN YOU BUY THE THERMOSTIC, THE GASKET COME WITH THE UNIT...IF YOU BUY AFTERMAKET THERMASTIC, THEN THE GASKET A LITTLE DIFF...BUT YOU CAN REUSE YOUR OLD GASKET TO INSTALL... NOT SURE WHAT YEAR OF YOUR CAR...BUT I WOULD GO OEM...BUY ONLINE WOULD BE CHEAPER FOR OEM PARTS... OR CALL TOYOTA DEALERS TO SEE HOW MUCH COST...
LINKS FOR TOYOTA OEM
http://www.trademotion.com/partlocat...&siteid=214074
YOU DON'T HAVE TO BUY THE GASKET...WHEN YOU BUY THE WATER PUMP, THE RUBBER GASKET COME WITH THE WATER PUMP.. SO YOU HAVE TO USE NEW RUBBER GASKET WHEN YOU INSTALL THEM...
HINTS... USE LITTLE PVC SILICON ROB AROUND THE RUBBER WITH SILICON SO IT HOLDS BETTER WHEN YOU INSTALL THE WATER PUMP... GO OEM SILICON...ONLY LESS THAN 20 BUCKS..OF YOU DECIDE GO AFTEMARKET, BUY SILICON FROM NAPA (BLUE LONG TUBE)...DO NOT USE HOME DEPOT PCV SILICON FOR CAR!!! BETTER QUALITY I THINK...READ TO MAKE SURE IT SUBSTAND HIGH TEMP. WHEN YOU TAKE OUT YOUR OLD THERMOSTAC, LOOK AT CAREFULLY HOW THE OLD THERMOSTIC POSITION WITH THE DOT..SO PUT BACK THE SAME WAY WITH NEW RUBBER AND POSITION THE SAME WAY..
HOPE THIS HELP ANSWER YOUR QUESTION....