The 1g Fluidyne will sit into the lower brackets just fine. It will be shorter though, like others have already said. I ran a 1g Fluidyne in my VR-4 last summer and am now selling it due to ditching A/C and getting a scirocco one. Here is a picture of mine when I had it in. I had some aluminum pipe that was perfect inside diameter to replace that socket. So I cut two little pieces and used them. Worked find and didn't look shitty IMHO.