@Rtec1 did you see my message about the detolf sold at Ikea?
My concern is the height of each shelf is shorter than the turtle at 15 3/4". I was going to get this originally, but was reluctant after measuring each turtle.
https://www.ikea.com/us/en/catalog/pr.../?query=detolf
Sorry mate just seen this! You've got a couple of options, You can get a Besta like Psyco said or go on eBay and get some 6mm U Bolt grips for dirt cheap and adjust them yourself.