I agree with this. Fat chance, basically, of finding four clean 2231's. Also, I tried 2235H's in my 4333a's in place of the 2231's. Although I went back to the 2231's because I didn't think the 2235's worked well with the built-in 800Hz midrange high-pass, the bass of the 2235's was better. In your 4350 clone there is the additional midbass driver and there is no built-in mid-bass high pass to be concerned with. To me 2235H's (2225/2235 frames with new kits) would no doubt be the better option.