Reviving this old thread. My fj40 is a '76.
I had one of the two drain tubes (driver's) and it was rotten and full of black swamp crap. I got some 7/8" heater hose from Ace, stretched out the end using various garage-y methods and with some grease and foul language got it over the cowl end of the fitting. With one size longer bolt I got the original firewall clamp to go around it and clamp nicely, right about how it was supposed to go. It not being pre-molded
It wouldn't fit into my original grommet that was in ok shape for 45yo rubber. I reamed it out with a sandpaper drum on a dremel tool until it fit tight. I didn't check to see if I had a grommet on the other side, but I would guess so.
Like I said, I have 2 remnants of the driver's side with about 1" missing that was lost trying to get it out of the firewall clamp. I can fish it out of the waste basket in the garage and send it along if you (
@Racer65) want it. I don't have the passenger side and I haven't replaced that one yet. I could make a fair guess as to it's shape once I get under there.
My rig is on a slide driver's-side-down slope and the rain will run nicely down that one tube until I pull it out to where I can work on the other side without hating my existence.