I have an MtH Erie 0-8-8-0 PS3. Product #20-3442-1E. The front electro-coupler is broken and needs to be replaced. I know they come in 2 lengths, 44mm and 51mm. (Pretty sure the one i need is the 44 but please confirm). If that is correct, I have found 2 MTH part #s for this: DD-0000062 and DD-00000-32. Is there a difference in these? If so, which can or can't I use? Will they both work on a PS3 engine? I have found the -62 which I can get pretty quickly. Thanks in advance for the help.