1948 chevy thriftmaster bench seat adjusting

Not sure because this was 20 years before I was born,but the 70's erra seats has the handle with the fork/finger locking teeth with the return spring on the drivers side and there was a tiny hole on the inside where the wire goes.On the under side of the seat attached to the steel wavey springs there were loops just like hog rings that were used to route the wire to the locking lever on the other side.If this is the type of set up you could also use the hard plastic air line.Any heavy truck parts place will have it and it comes in many sizes.Would be easy to rout your wire thru.Well hope the helps and good luck.