I'm on my 3rd set of sun visors for my 1968 VW Bee...

I'm on my 3rd set of sun visors for my 1968 VW Beetle, my auto upholstery person purchased them from a local retailer, every time I go back I'm met with sorry excuses of why they keep slitting.
I don't care about why!, I just want some that DON'T.
NOT A VERY HAPPY CUSTOMER