Unbolt and bolt up…
The 60% side has a frame work that bolts to the driver’s seat and supports the extra part of the seat.
My ’03 60/40 just unbolted, I bolted on a set of buckets, so you should be able to unbolt the ext cab brackets and bolt then on the other seats.
Start by removing the backs, the remove the seat brackets from underneath.
The center console shouldn’t have to unbolt, if I remember correctly but not completely sure, easy to take apart just watch out where everything come out of and reverse it.
4x4, 5sp, Std Cab, Stepside, E4 Red
4” Lift - Coil-Overs, 6” SkyJacker Leafs - No Blocks (Mistake)
31 Spline FX4 Rear Axle, 4.56s and OX Locker, Hurst Shifter w/Optional Stick and "Made by Grev" alignment adapter