I am trying to find a replacement for a Bryant CK3BXA048 "N" Coil. I haven't been able to find a matching number. It is a 4 ton horizontal coil. Can you make any suggestions?

Seems the unit is obsolete from Bryant and no longer made. You made need to replace the entire unit.

Here is the manual and specs on your unit:
http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/pdsck3b.24.5.pdf?SMSESSION=NO

Here is a similar unit from Bryant:
http://www.bryant.com/products/coils/evaporator/updownn.shtml

Hope this helps.