I too did not remove the injection pump. I did remove the fuel filter cup, filter, and long bolt. I also removed 1 power steering hose, from just the steering box, but left the other end attached. It gave me a little more room to work that rear area of the cooler. The inner oil pipe fitting on the oil filter stanchion came loose, instead of the oil pipe nut. I was able to sneak the cooler out, with that shorter pipe still attached to the stanchion. I purchased in inexpensive 24mm wrench, and slowly ground the open end thinner, so that it would fit between that stuck oil pipe nut, and the fitting on the stanchion. The wrench was long enough to brace against the front area of the steering box, and hold that fitting securely, while I applied a lot more force to the oil pipe nut. The nut finally broke free, allowing the pipe to be removed.
I installed my good used cooler. I also had a better set of oil pipes, so cleaned those back to bare metal, and sprayed them with clearcoat. This also allowed me to use a solid "long" pipe from cooler to stanchion, instead of the pipe that's always been on my car, which is a combination of a metal pipe connected to a rubber pipe. I replaced that leaking rubber pipe back in the 90's, but didn't like how it looks now. The long pipe also looks nicer/cleaner.
So the job is all done, and now I wait for the radiator to be returned.
