Hi Ya'll,I was going through my Nissan part box and ran across this grommet.I bought 2 back in 01/12/2010.It is brand new still in the package.I now have a custom made heating and air and this part is not used,the hole in my firewall has been plugged up with a piece of Dynamat.One  that was on my truck was throw away by the installer.The part number is 27035-S0100.It is a discontinued part.I can look it up in my receipts and see what I paid for it.It is used for the 2 heater hoses that come through the firewall to seal it from air getting into the cab.I also have a new Nissan blower motor relay.They make 2 different types for our 720's and Nissan gave me the wrong one back in the day,guess I ordered the wrong one and I just kept it,It has the white plastic piece and the other is black,I can show it if anyone wants it.https://www.nissanpartsdeal.com/parts/nissan-grommet-heater~27035-s0100.html?vin=&make=Nissan&model=720 Pickup&year=1985&submodel=&extra1=&extra2=&filter=(1=K%2fCAB;2=Z24;3=DX;4=F5;5=LONG;6=4WD;7=FED)