Scan down the index to this Rubber Side Down Section - there are several discussions going on about handlebars, and the answer to the length question may be in one of those.

The early Buckhorn handlebars had the longest cables, later drag bar bikes had shorter cables.  The Savage does not have a lot in common with other bikes - so you will not find much that is universal or made to fit our specific bike.

If your electric wires no longer fit....you will just have to take the wiring harness apart and splice in some longer wires.  You can make your own clutch and trottle cables by ordering a kit from Venhill...you have to know how to solder well, and don't use the flux made for copper pipe as it doesn't work on steel.  You can also order longer brake hoses from them if you need a longer one.
http://www.venhillusa.com/

stock buckhorns on top of the drag bar risers might be a tight fit.
buckhorns should fit if you take the risers out.
drag bar cables are shorter than buckhorn cables.

Yes I am aware. I have done extensions on multiple bikes. Although on them harleys they have kits everywhere for em. I am leaning towards short risers and the 8 inch bars from low brow customs.  https://www.lowbrowcustoms.com/products/cycle-standard-mini-ape-hanger-handle...

I remember seeing a thread a while ago stating that buckhorn handlebars will not fit on an S40, the stock cables were too short.

I fit 12" bars before on a Savage that had stock buckhorns