Have you done a spring over swap yet?
If memory serves me right the M101 (canadian) and m416 (usa) use early Jeep CJ (41-53) springs. So getting getting some lift shackles should be as easy as CJ lift shackles are pretty common.
4WD Hardware has 2.25 inch lift shackles,greaseable bolts and bushings for $85+ shipping here:
http://www.4wd.com/Jeep-Lift-Kits-Jeep-Lift-Kits-Suspension/Front-or-Rear-Greasable-Super-Shackles-by-Daystar-for-Jeep.aspx?t_c=1&t_s=399&t_pt=3647&t_pl=8573&t_pn=DAYKJ61003BK
(looks like they also carry .5 and 1.5 inch lift shackles)