IMHO - the 300ex conversion kit is god awful...it's ridiculously wide and if you don't widen the rear it really looks "different"...LOL

You're better off doing what I did (adding an early {85-86} LT250R front end on)...you get reasonably wide a-arms, disk brakes, can bolt up Fox Floats, corners flat and steers super easy...my boy loves it...won't even look at a stocker anymore...

 

What about welding the mount points on the outboard side of the frame instead of the middle? You then have the same length A arm but the pick up point is further out for more stability.

 

Are you referring to the stock a-arms?

 

Yeah I saw a video of a guy that used stock a arms and just welded on new pick up points to the frame.

 

Yes...that will add stability, but now you'll need to find longer shocks that are sprung for that machine/rider and that will increase travel and increase the negative camber I mentioned above as the suspension moves through its stroke. Personally, I think the stud extensions are just fine if you only want "stability", but I'd caution against the negative handling impact when the suspension is compressed (very little tread on the ground / \)...my $0.02...