The link below show the concept of what you want. How much weight on the shelf? They might work, or you could have a metal shop make some out of thicker wire. Here is a link that might be useful: Concealed wire shelf supports

I'm wondering what different people here mean by "wire shelving." The comments about it being "cheaper" suggests folks are talking about something different that what I think of for "wire shelving." Mine are several hundred dollars a bay, which is certainly not "cheap", or "cheaper than wood." I suspect people who don't like them have some sort of low-quality shelving, like I've seen for sale in a hardware store around here. I have "Metro" shelving, and it's great. "Cleaning" isn't an issue--it stays clean with having to do any cleaning*. It is rare for there to be a problem with things falling over. Light comes through the shelves, which makes it much easier to see what is there than if they were solid. (I note that I run a lot of it quite close together--like one 14-oz. can high, so that I can pack of lot of stuff in not very much space.) I've attached a link to the kind of shelving I have, except that I have about 8 shelves in the same space as their illustration shows 4 shelves. * Regarding cleaning: I've done some work in a Class 10 cleanroom, and all the shelving there was exactly the same stuff (though the stainless steel version rather than the chrome version, because all the metal in the cleanroom is required to be stainless steel). It's there because it's the cleanest shelving available. To give you some idea of what is expected there, people have to be in bunny suits, wear gloves, and go through and air shower before entering. Here is a link that might be useful: Metro shelving

For what it's worth, I mentioned this thread to my DH and he noted that he LOVES our Elfa wire shelving and said that he would NEVER want to go back to wood shelving as we had in the pantry closet of our last house. He also mentioned that--at least when we bought our components--he thinks one could mix and match solid shelves and wire shelves, so one could have some solid shelves for small items or things that tip over more easily if one really wanted them. Just a thought. BTW, Elfa systems are more expensive than other wire shelving systems, I think. But the Container Store usually has a big sale on them at least once per year that makes them much more reasonable.

There are many adjustable shelving systems besides Closetmaids wire system. If I understand you don't currently have the adjustable standards in the closet just a single shelf. In general if you want solid adjustable shelves I would buy generic standards (vertical pieces with the holes for brackets) and matching brackets in the width you want your shelves. This allows you to secure the actual shelf to the bracket with screws. There are many different types of products available, good luck.