I've been organizing and reusing items as much as possible. I have a laminated white cabinet made of particle board with holes drilled along the inside for shelves but the shelf pins I have didn't seem to work. I went looking for some slightly smaller and couldn't find any and I didn't want to chance trying to make the holes larger. So I found some metal screws just the right size and was able to put a shelf in it. This holds my daughters cake decorating supplies nicely. I love figuring out unique solutions for problems (I raised 9 children and it was absolutely necessary).
Screws were a good idea. However, you could also go to a craft or hardware store and find wooden dowels that you could cut to whatever length you needed. These stores usually carry a good variety of dowel sizes from the smallest diameter to larger ones. They are relatively inexpensive and one would probably make 6 or 8 "pegs" what you need to put into those shelf holes you need. I have a cabinet like you mentioned and it worked for me when I lost one of the shelf pegs for my cabinet.
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