What's that rear seat out of?
About two pages of posts ago, not jump seats but a two-place that goes across the back. Looks like you likely had to fabricate mounting brackets also.
'bout ready to finally start wrenching and brakes are an early item on my 4/76. I currently have almost no stopping power, at all. I think I'll just fix/adjust everything back to factory and go from there.
Just to update:
https://www.toyotapartsdeal.com/parts-list/1976-toyota-land_cruiser/body/fuel_tank_tube.html
Fitting Vehicle Options: FJ40
Part Name Code: 77100
Replaced By: 77100-60042
$393.46