904 Floor shifter conversion questions/help

Has anyone out there used an aftermarket floor shift conversion? Such as Mr.Gasket 3-4 Speed Automatic Floor Shifters part number 7668. I have the 904 Transmission in a 74 Duster with bucket seats. I would love to have the shifter mounted to the floor, but don’t have the budget for the console conversion. I think this would be a sweet set up if it worked! Anyone use this or anything like it? Any tricks or ideas? Anything else I should have to buy for this? Thanks again.

http://www.summitracing.com/parts/mrg-7668/media/instructions