Rectangular dog holes?

Hi, new to the shop! noticed the handtool workbench has rectangular dog holes… does anyone know how well it takes standard 3/4" bench dogs / holdfasts? I didn’t see any around the bench area, so thought I’d ask before getting my own (which I’d be happy to share).

I believe it takes standard dogs. There are some shelves under the tables they may be there?

Thanks Flip, I found the square dogs that fit the bench. I’ll get a cheap holdfast from Woodcraft and just leave it at the shop if it fits, and otherwise return it.