This is the answer I was hoping for... Bought it from a guy from eBay claiming it was for an IS300. I put it on and used an extended hose from O'Reillys and it fit fine. I have to bleed my brakes tomorrow then I can let you and anyone else with the same problem know how it goes.I second the question above. The right booster should fit normally unless you are not stock.
That being said, it’ll work upside down. It’s a vacuum storage tank with a plunger.