I just purchased an Aristocraft Sierra passenger car set & hooked them to my Bachman 4-6-0 "Annie" and was surprised that the couplers did not match up. Not only was there a differance in height,[bachman's are lower] but the locking mechanism was slightly different. It seems like they would not click together properly to stay coupled. I think the easiest fix would be to change the bachman coupler to match the aristo's. My question is what brand coupler should I use . I want to stay with the knuckle style coupler. I see some folks use Kadee couplers, is that the way to go? If so what style or number are they? Or any other suggestions, I'm a newbe so I apppeciate the help. Thanks Oz