Quoted:
Is
this what I need to order?
do I have the ability to swap these in?
View Quote
Yes & Yes.
Long story short -- you're going to need eye protection, a screw driver if you want to remove the grips (not necessary but helpful), a pin punch, and something** to push down on the sear spring to get it out from under, and back under the pin that holds the sear spring in place.
**The ideal inexpensive tool for this is to take a cheap small flat head screw driver and dremel a little notch into the tip of the blade. This will be useful in all future SIG strip-downs-to-the-frame.
Once you use your tool to release the tension on the sear spring, you use the pin punch to push out the pin holding the ejector, sear, sear spring, and safety lever. Then simply set aside the old sear and safety, and replace with the new sear and safety lever. Reinstall as they were.
There are numerous YouTube vids on the subject as previously mentioned, but if you have questions, just ask....I've done a number of these. It takes longer to watch the videos than it does to do it.