Lower control arm bolt kit available in the two sizes that wer used by GM.
1/2" for 70-72 Camaro 70-73 Firebird.
9/16 or 9MM  as used in 73-81 Camaro or 74-81 Firebird.
NOTE we strongly advize that you check the size you need as 73-74 can be transitional years, be advised this item is NON refundable/returnable.