I don't have answer yet
Different manufactures have different numbers, so check this out...http://www.carid.com/2005-hyundai-elantra-engine-parts/dayco-engine-timing-belt-kit-with-seals-24638696.html
I see you can get just the belt, or different hole kits that would include seals, pulleys and water pump. Hope you are doing the water pump also.
Looking for a Used Elantra in your area?
CarGurus has 53,040 nationwide Elantra listings starting at $1,000.
Search Hyundai Elantra Questions
Hyundai Elantra Experts