O.K. ya got me. 2000-2003 use the D32 pump and 04-06 use the D61. Doubt there is a difference in the plug and I suspect that eventually they will all use the D61. But I don't work for a dealer anymore so you could check with them as the final authority. I looked at my local Honda dealers parts reference online and D32 for all US models through 2003. IF the plug changed that would mean they would change the rear wire harness as well and I don't see them changing the plug. The last 3 digits in a Honda part number usually indicate color or material so If primary number 16700 for fuel pump and center code MCF for originating model, RC51 in this case, didn't change pump is likely the same and and has some minor upgrade. There can be exceptions as always. I just ordered one about 3 months ago and it may have been a D61. Seems like something sticks in my old fart brain about that order. Was cheaper than dealer by about $20 but also free shipping and no tax so about $55 savings over my local dealer who has a discounted price of $408. $383 from Partzilla. Hope this helps.