The 4x4 front hubs are a bit different from Std. Sierra hubs, I think.
I asked the question on Locostbuilders a while ago when I was contemplating a 4x4 cossie donor (after a session in the pub!)
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Originally Posted by locostbuilders
4x4 front uprights are very different to 2WD ones. They require a bigger diameter 'mushroom' insert (MK custom made me a pair) and a pinch bolt lower bj rather than the taper maxi one 2WD locosters use. Hard to source a suitable load-bearing joint to fit this if you want to keep a standard shock arrangement which loads the bottom bj. Dax's solution is a custom made joint for them (you can buy but pricey), my solution was to go rocking-arm inboard which makes the top joint the loaded one. Then I could use a standard non-load-bearing bottom joint (fiesta I think).
If you're using a cossie donor, the front uprights are different again to XR4x4 stuff - the top strut mount is further inwards (so the cossie could run wider wheels without hitting the struts). This means your top wishbone has to be shorter.
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Not trying to cause a ruck, and if I'm wrong then I apologise in advance
Sean