seat belt mounting

I've considered upgrading to shoulder belts several times. I've promised to give my red car to my grand daughter and surely will upgrade before she starts driving it.
My main concern with aftermarket belts is the quality of their buckles.
Even some factory OEM belt buckles were absolutely crap ! See Geo for reference LOL
These XVmotorsports belts are priced quite a bit higher than the brand normally seen on ebay. Quality and cost are usually related so we can expect these to be well designed and built. Time will tell. Good luck with them.