Brownell's website is funny. You've really got to spend a lot of time sorting through it to find what you're looking for. Fox example, if you are looking for the P226 decocking lever spring... If you navigate to Handgun parts>other small parts>sig p226, you won't find it.... But if you navigate through Handgun parts>springs>and sort by mfr Sig Arms, you'll find it.... BUT the Slide Catch Lever Spring isn't listed there, even though they have it...
Decocking Lever Spring: 732-000-029 (5.54$)
Slide Catch Lever Spring: 732-000-347 (4.00$)
Trigger Bar Spring: 732-000-391 (4.00$)
Grip Screws: 732-000-100 (2.00$ ea.)
Outer Pin: 732-000-260 (4.00$)
Inner Pin: 732-000-166 (4.00$)
Recoil Spring: 732-000-271 (13.88$) <---- consider going with a Wolff spring instead
I believe that is the contents of the spare parts kit... Someone correct me if I'm wrong. I also threw in a short trigger and the MWT Sig Sight Tool when I was ordering all of this stuff for my 229.
Copy the stock # into the search field in the top left corner to see the part. I can't help you with the grips, sorry. I think the grips on my 229SAS are the cats ass and I would never consider replacing them
Good luck.