We just installed one of these on my friend's 40, he bought it here:
link: Amazon.com: Aluminum Radiator Toyota Land Cruiser FJ40 FJ45 GAS Fits Year 1970-1980: Automotive
I've read some people have had interference with the radiator channel (we did too). I'm just posting this as an example, but we bent his channel out a little with some locking pliers (the steel is pretty soft) and it worked fine. I did pinch a little Oil-Resistant Buna-N Rubber Sheeting (link: McMaster-Carr) between the radiator and channel just in case it tries to rub, but otherwise, pretty straight forward. Pics below.
link: Amazon.com: Aluminum Radiator Toyota Land Cruiser FJ40 FJ45 GAS Fits Year 1970-1980: Automotive
I've read some people have had interference with the radiator channel (we did too). I'm just posting this as an example, but we bent his channel out a little with some locking pliers (the steel is pretty soft) and it worked fine. I did pinch a little Oil-Resistant Buna-N Rubber Sheeting (link: McMaster-Carr) between the radiator and channel just in case it tries to rub, but otherwise, pretty straight forward. Pics below.