From memory, the manual seat models don't have the wiring in place for the electric seats. It's not impossible to install the necessary wiring, but you will likely need to configure the CJB to activate the seats too. The seats get their power from the rear fuse box, which might not have the fuse positions in place, so you might well need to find the correct fuse box too.
Like I said, it's not impossible, but could be a lot of work, for very little gain.
Alternatively you could look for a set of full leather seats from an XS, which has leather manual adjustment as standard.