It seems the 226 and the 320 were added recently to the parts picker on the SIG site. I apologize if someone already posted it but I couldn't find any.

Pretty cool.

https://www.sigsauer.com/p226-parts-picker/

https://www.sigsauer.com/p320-parts-picker/

That is really useful. They should add other models and parts for the earlier Sig pistols.

They have slowly been populating the models. I'm sure it's by ease of implantation and popularity.
I would suspect we'll see 229 next. Not sure what the next popular SIG is. MPX?

Very helpful.