Help with Couplers, please

[brett435]

Hello!  Can someone please help me identify the couplers I need to replace. I have attached a photo of the engine and car couplers. They are from an old Acela HHP-8 set.  I measured them as close as I could.  Bachmann doesn't put the measurements on the parts store site, and I am not sure about what identifies a center knuckle versus other types.  THANK YOU!

[Len]

The upper coupler (16/64") in your pic is a Short Underset Shank Coupler, the lower one (25/64") is a Long Center Shank Coupler.

The short couplers are normally referred to as having a 1/4" shank, rather than 16/64".

A medium, or standard, shank coupler has a length of 19/64".

Len