I would like to change all of my couplers to the new (smaller) dummy knuckle couplers.  I looked at the couplers in the accessories (product code 4232) but there was no way to tell if these were the new (small) couplers or the original (larger size) ones.  Also, do the springs come with these?  The picture of the package was not very helpful. 

Is the lighting kit supposed to be connected to the accessory terminal on the power supply?

I found a lighting kit in the HO accessories (product code: 42240) and am not sure what it is for.  I'm thinking that it is for illuminating plasticville buildings.  I am  trying to illuminate N scale buildings and would like to know if this lighting kit will fit N scale as well a HO scale buildings.