The bushing was never a cataloged S&W part.
The guide rod (S&W 108620000) appears to be discontinued -
Smith & Wesson Recoil Spring Guide Assembly S&W 4013TSW 4053TSW

You could probably have someone like BMCM fabricate them.

There are two choices for the (-1) single recoil spring -

The factory spring (S&W 201330000) is also discontinued but still available from Cylinder and Slide.

Wolff 47716