floor mount shifter

hi i got a 64 nova with a powerglide, the shifter is on the column, i wanna make it on the floor so i can have a really tall shifter, i seen an automatic floormount shifter and then i saw a trans mount shifter, whats the difference? which do i need? and where would be a good place to get one? thanks

edit* i found the one i want, its a gennie shifter