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I would not let the fact that a certain model 1911 doesn't have an ambi safety limit my choices or you could end up disappointed with what you buy.
Just picked up a new STI Spartan IV and it cost me 60$ to have the shop I purchased it from install one before it was shipped. That's 60$ for the new stainless safety and installation was free. Not that I couldn't have done it myself but they had the gun already and are gunsmiths. In my opinion an ambi mag release is useless because I can easily reach the mag release on mine with my left hand.