shoulder belts for Daughters 65 Barracuda
Only if you're trying to get her hurt! Spend money on seatbelts that are both
new and
good, then hope you never have to get your money's worth out of them.
I used to recommend retrofitting 4-point Wesco belts as I did on my '71, but
not any more (the article is correct in its facts and physics, and everything said about 5-point harnesses is equally true of the 4-point variety, except the additional injuries that a 5-point can do to a male driver).
These up-to-date, reputable-brand ECE-approved 3-point seat belts are what I now favor. Linked vendor is reliable; I've been buying there for a decade. More info on mounting at the
maker's website. If I needed mounting hardware, I'd buy it again
from Wesco (and their page has good illustrated write-ups on how to install belts in pillarless cars like yours
here ), but the Securon belts are a much better-designed product than anything Wesco carries.
There are also bench- and bucket-seat 3-point belt setups available from
XV Motorsports, but I am hesitant to recommend or use them until I have more than a one-line say-so from the company that their belts actually meet the relevant safety standards; discussion on that matter is
here.
Truth to tell, though,
daredevil has it right. Kids really shouldn't be in old cars. They really
aren't safe. It's one thing for an experienced, mature adult to use that experience and maturity to adjust his driving to account for the lower safety performance and capability of an old car. It's quite another to send an inexperienced, immature kid out into traffic in a car that provides zero margin for an "oops".