So, over the last 7 years of driving in fair weather and making improvements in the winter months I just installed the 3 point seatbelts from Julianos. I researched the options, read the threads on this forum. It was always on the to do list but never made it to the top. I went back and forth between going with just lap belts, or 3 point. Made decision to go with the 3 point belts after watching this video. The violence of a crash in an older vehicle is shown from different angles and slow motion.
https://www.youtube.com/watch?v=5oO226PgSkg