Installing shoulder belts in 79 Spider?

[qposner]

I purchased, and had recovered, a pair of seats out of an 82 Spider for my 79. They also came with the shoulder belts, which was one of the reasons why I wanted a later model seat. Anyhow,the car goes in for new interior in a few days and I need to know where everything mounts. Can anyone describe where things go relative to the older lap belts/post pics? As always, I appreciate your help. You guys have made my life alot easier.

Quinn