Your computer & printed are incorrect, sorry...
And 2204 is very, very wrong -- because 2204 & 2205 fit 1959 - 1964 Pontiac.
I am "assuming" you "typoed" 2 2 0 4.
Annnnnd, I have them -- I don't have to next day, anything.
2303 & 2304 is correct for 1966 & earlier -- they are NOT exactly mirror images -- but they are Left & Right....
Some companies have indeed obsoleted / discontinued them....
I do have some N.O.S. U.S.A. made......
I have some USA made slant 6 mounts -- and I also have some N.O.S. Front & Rear
++ Asbestos ++ Brake shoes for your car....
I'll give you a "package deal" if you'd like!!!!!!