Outer Limits 4x4 Board

I'm thinking of putting extended shackles on my hilux (1990 DC), the current ones are 125mm long 5" i was thinkin of going to 7". does anyone know how long the after market ones are? how hard are they to make yourself? Other than longer brake lines and longer shocks is there anything else i would have to adjust/change.
Advice would be much appreciated. thanks.

The ones I make are 3 way adjustable [and sell in Perth ]
You can set them at stock or 45mm 50% 0ver stock or 90mm 100% over stock , They have 4140 molly pins and are greaseable and have 8mm plates
You can set them low for the fuzz and high to play

Adrian

thanks guys, time to start saving i think.