So as it says, mine is #175 (3-21-01). I looked down the port with a flashlight and the top is sorta chrome looking like the new driver but the basket part doesnt look like the new one. About when did the new driver come in? I'm very excited about the prospects of this cheaper upgrade as I can't afford the cost or space of dual subs and selling old/buying the new CS+ would be tricky. I also have the samson s700 so not quite as much power available as the s1000. TPM thx trailer can easily bottom the current driver at the levels I like to listen at so extra headroom is greatly appreciated. I do think that I'll keep the old driver though to make a little sub for my PC system. This is something other upgraders should consider rather than just sending it back for the credit.