If you just want it about 1-1.5" taller you can just do damping rods and longer rear shock. This would bring it up close to the same a L model. If im not mistaken the L uses different swingarm to work with the longer L shock and the forks are mainly just damping rods anyway.
I converted my 2003 DRZ by ordering a inverted fork kit with triple tree and added disk brakes to it with a 17" front tire and then extended the rear swing arm 3" with a 14" rear tire using the stock rear shock. All together my bike is about 3" taller but I had to extend the kick stand.