Hi,
 
	I’m not sure if you solved your magnet problems (shapes, durability, sourcing), but K&J Magnetics has ALL kinds of shapes and strengths.  They can also make custom magnet shapes, but those are $pendy.
 
	Here’s a link to their site:
 
	https://www.kjmagnetics.com 
	 
 
	Enjoy,
 
	Michael