I want to replace the inner and outer guide posts and guide bushes of an old hardware mold. What is the correct process?

Remove the original hardware mold, pin the upper and lower molds of the old mold together, and re-bore the holes. Then reassemble the guide posts and guide bushes. If you still want to use the original hardware mold, then you need to align the gaps between the convex and concave molds of the hardware mold and fix them with the upper and lower templates. Remove the old guide posts and guide bushes. Then use this as a basis to re-bore the guide posts and guide bushing holes of the upper and lower templates, and then reassemble the guide posts and guide bushes.