I've had Dunlop Straploks on my basses since the 90's. I've put them on every bass, but they come as standard on Lakland's, Lull's, and Sadowsky's and many other US basses. They are also rebadged as Allparts Strap locks at half the price.
I've never used them, but Grolsch washers apparently work well.
Be aware if you are getting replacement strap locks for the first time. In the last 20 years I've seen people reporting problems with Schaller. Dunlops are fine, but the Schaller screws often don't fit into the existing holes very well and can work loose, causing the bass to hit the floor!