The hoses to a FJ62 fan run up through the floor, but modifying the hoses to run under the floor shouldnt be too hard. If youre interested, I have a 62 rear heater that I may not need. Let me know.
If anyone needs them, I have a 62 rear heater and hard/soft lines from the Y at the firewall back to the heater. The only thing missing is the last part of soft line that makes the 90 degree turn and goes up through the floor and connects to the bottom of the heater.