Most parts are standard 1911. In fact, if you buy the gunsmith kit from Paraordnance to build your own, you only get: frame, magazine, magazine release, grips, grip screws, trigger, and contour plate )which is necessary for Series 70 pistols with no firing pin safety). You might need special safeties if they are extended, not because of width of frame where shaft passes thru but in order for the paddle to clear the grips. If you order parts from Ed Brown, I think they have a special area for those necessary for Paraordnance.