I have a Coleman Evon gas central heating system DGAT070BDC, inside the standard blend air II 7681-8191 is a relay that is bad. I changed the relay, it was no longer being made, with what a sales person said was a suitable substitute. Where can I find the correct part number for this relay

Here
PartsGuy.com -- Coleman Evcon 7681-8191/A switch (http://www.partsguy.com/cgi-bin/PartsGuy/76818191A.html)

Here
24 Volt Inducer Booster Relay Used in (Coleman York): American HVAC Parts (http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=REL795667&Category_Code=relays-booster)