In case anyone wants to make this modification, please allow this post to serve as an update to the original query. It turns out that the sleeve swap is possible and relatively easy to do. The smooth sleeve simply takes the place of the original shifter sleeve and shifter. As I'm sure most of you know, the gear indicator in the dash is not correct on a floor shift model. I believe a floor shift model has the gear indicator blacked out in the dash. However, the smooth sleeve has the hole to attach the cable operating the in-dash gear indicator so it can still be used. If you didn't know what you were looking at, you wouldn't know it didn't belong. Pretty happy with the outcome.