Louie Louie WAS the ‘B’ side.
“’Louie Louie’ is released by Flip Records on a 45 single as B-side to ‘You Are My Sunshine’. When ‘Louie Louie’ attracts more attention than its A-side the single is rereleased with ‘Louie Louie’ on A- and ‘Rock Rock Rock’ as new B-side. These singles becomes a minor local hit in the LA-area. “
Impressive!