I have the same issue. I've decided to make a C shaped flat metal bar (curved on the flat) to attach to the firewall bracket, go around the booster and connect to the shortened rod on the driver's side.
Those rods are necessary because the cab and front sheetmetal is all mounted on rubber isolators...the rods add rigidity in a free-floating system. I mounted my radiator core support rigidly to the frame and eliminated the need for the rods.
well there has got to be a way to install the brake booster,, or they would not make them ?? , i guess do a horse shoe piece of metal around the booster and have the rod to connect to that ,, it will look stupid but it will work ??