I'm confused as to exactly which wing bolt is correct for 50's/60's bass drum cymbal mounts and floor tom leg mounts.

Both part no. 4941 and 4933 on page 20 of the 1966 Gretsch catalog seem to work fine and I have a late 50's Gretsch kit with all 4941's and no 4933's

- just wondering which one is correct?

I have attached a photo of the 4941.

Thanks in advance for your help!