Shelves for a Racks

I have seen alot of videos of people who have reg shelves as racks ... Im fine with heat taping something on my own if I can find something. Does anyone know where I can get any.. Im also no Bob Vila so building my own is out of the question. If there are none I will just order another CB-70 from Rich but i am curious because alot of vids have alot of makeshift racks.

I was in the same situation, My research concluded when I decided to buy rack at costco that has a metal frame with holes for adjustable height. anyways most of the videos and threads I read had the plastic adjustable shelving that people sawed the posts to adjust the height there are 2-3 youtube videos. Anyways my rack is a bust as of now, simply because i need to find tubs with lids that will fit in a 45 inch long shelf. the tubs I have now only fit three to the top shelf because they =47 inches lol its a pain in the ass I wish I couldve just waited for the reptile plastics or what ever they were nice but 5 weeks wait def detoured me from the purchase. anyways didnt mean to be "long-winded" with my post.