That's where I found the specific PE parts I was looking for.
But the kit is $30 and has 12 sets of seatbelts.
I did a lot more hunting around on the Eduard site and found a PE superset for the Academy Seahawk that had the jump seat seatbelts as well as the Pilot, ATO and SO seatbelts. Much cheaper because it's not pre-painted.
Now if Quinta or Red Fox can get their cockpit 3d printings done I'll be set.