The LG 5230A20057A Air Filter is the correct replacement for the following model numbers.
air filter
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LP126CD3B
lp126cd3b
3720A20710A
lp126cd3b-air-conditioner-control-panel
EAU57945705
lp126cd3b-air-conditioner-outdoor-fan-motor
5901A20051A
lp126cd3b-air-conditioner-condenser-fan-blade
EAU61903001
lp126cd3b-air-conditioner-evaporator-fan-motor
4960A20032A