Horn Relay Replacement

Getting some first rate help from local parts stores on a replacement relay for this Duster. I am needing a horn relay for a 72, I ran through some troubleshooting - all of which led me to the relay being bad. Ended up opening up the old relay to confirm my findings and sure enough, wire leading to the coil was burned through. Anyone have any replacement part numbers I can get these local goons to look up? Numbers on the original are:

1642
3513 211 -
36033K

None of the numbers came back with any results for them or so they say. Hard for me to believe these aren't still out there - I searched on the internet for them and they are a multi-use many years, found a few on ebay...