I don't know if the bushings have a different frame thread size or not. I've never had the bushings out of my Norincos to check. If the standard size bushings don't work perhaps you would have to get the oversized bushings from Brownells and the tap to install them.
------------------ Ne Conjuge Nobiscum Molon Labe
[This message has been edited by Jim V (edited 05-09-2001).]
The Norinco grip bushings are not standard size and regular 1911 bushings will not fit. If you want to take the bushings off to install shorter bushings for slim grips, it's easier to grind the bushings shorter than to buy oversize bushings and tap a new hole.