Record dividers alphabetized one for each letter.

I'm on the hunt for some record dividers for your shelves. 

Must haves:

-full sized dividers, so not to have just a strip along the bottom of the records. I find that they never sit properly, hang out or crooked. yes i have some OCD maybe. 

-one for each letter, min, larger collection so A-F etc., wont cut it when that's 350+ records per section. 

- not overly thick to save space and prevent potential warping due to not sitting flat against the adjacent record. 

I've seen some plan ones on amazon but everyone seems to be out of stock.

Any suggestions on nice quality dividers. I don't care if they are wood, vinyl, etc. but not cardboard. vinyl/plastics  is probably best for longevity and thickness.  

I use Ikea Kalax shelves.  

Thanks for the suggestions. links wound be helpful.