Below are aircraft that commonly need the 12-1021.
152, A152, 172N, 172P, 172RG, 177RG, 180J, 180K, 182P, 182Q, 182R, T182, 188, A188A, 188A, A188B, 188B, T188C, A188, 207, T207, U206E, U206F, U206G, TU206E, TU206F, TU206G, 207, T207, 210N, 210M, 210R, T210K, T210L, T210M, T210N, T210R, P210N, P210R when OEM regulator was a C611501-0102, C611504-0103 (** Requires purchase of adapter plate, 12-1021) R1224
114B, 114TC (4 Wire Regulators) with OEM Electrodelta VR515G, (**Requires purchase of adapter plate, 12-1021) R1224
This adapter plate did not fit well in my 79 TR182. The holes did not line up with the old voltage regulator.
Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.