First look at your upper ball joints. I suspect yours will have 3 bolts not 4. This means adding a pair of ball joints to the cost and remembering they are the earlier type each time you replace them in the future.
Very little info as to the manufacturer but it appears to come from Thailand and is similar to the old Calmini kit. Personally I would stick with a simple ball joint reposition which does 75% to 90% of what the front arms in the kit does and at no real cost. I see they are selling these arems on there own for 550
http://www.ebay.com.au/itm/Isuzu-MU-4x4 ... 2a43f4cb5bRear Others disagree with me on this but Im not a fan of extended shackles for 3 reasons.
First they lift your existing springs by amount x In this case 3 inches but if your springs have sagged by 2 inches you are still only 1 inch higher than standard
Second each inch you raise is done by extending the shackle 2 inches A 3 inch lift takes the original 4 inch shackle and makes it 10 inches. What you gained under the sills just disapeared at the rear end
Third all that extra length puts a lot of extra stress on the rear mount. Ive not heard of them breaking but you never know.
Do a hunt for new Rodeo springs instead.
My formulae for a 2 inch lift is ball joint flip up front and adjust the torsion bars. Only replace shocks if worn. Then new springs at the rear. I used Lovells when I did mine but thats only one of many good brands. For the Mu get Rodeo with 50mm lift but not heavy duty. Check your shocks after fitting springs by removing the bottom connection to the shock then lift the vehicle under the chassis till the wheel is off the ground. If the shock is longer than needed to go back on the mount the shocks do not need to be replaced unless worn
Sanding your knuckles before starting work can help. That way you cant skin them