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I almost had a machine shop make some 4" ones with my new forward controls. It is possible to do 5" with the stock set up. I have 3" ext. plus Supreme Legend Forward controls that push my foot out another 1" or so. There is plenty of room before my fender.
3 inch controls are the most you can buy from a manufacturer. I have the 3" extension on my bike and I am having MCC modify my seat so that it sets me back a couple more inches. That should give me all the stretch I need.
I have done both the seat and forward controls to give me the most room. The cheapest route would be to get a machine shop to make you something then PC it any color you want.
If i would have known to go the machine shop route i would have done it instead of the extensions from Arlen Ness. I still might get the machine shop to make me some down the road. I could use one more inch.