What type of parts store automatic transmission fluid can be used in a 1999 Hyundai Elantra?

"any brand of dextron III will work"

This is wrong. Use only the approved Hyundai ATF, SP-III. If that is absolutely not available in cases such as myself (in Alaska with no Hyundai dealer within 700 miles), ATF+4 should be fine (exceeds specs). Dextron III does not meet the specifications of the Hyundai ATF, and Hyundai transmissions are very picky.

I agree with the above. Dextron by itself is not enough. A chart I have recomends factory fluid,but if not available,Mopar makes an additive that should be added with Dextron.