I replaced the only two incandescent bulbs on my 2021 Silverado RST Z71. These are the Lasfit T-744A. Buy them here:
Lasfit 10% off discount: ohyeahaboutthat
2019-2021 Chevy Silverado Front Turn Signal Bulbs: https://lddy.no/zbht
Lasfit Website: https://lddy.no/d295
