Thanks for the replies. I've decided to replace the factory booster and try to use what I have. What I've done is cut the mounting bracket off the old booster and modified it to weld onto the 4th Gen booster. I also cut the push rod off the old booster, and the end of the new one. Then threaded both ends to 3/8-16 and used a coupling nut to join them. Just a bit of welding to do and it should be ready to install.