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Hello,

I would recommend starting by comparing the dimensions shown on the 84-016 and 84-091 product pages to your assembly to determine if one of them could work as a replacement. Thanks for posting! 

The curved top piece is just an older style but one of our replacements should be fine as long as the dimensions match up to yours. 

The open circle is another old design that the manufacturers that make these rollers no longer use. The newly enclosed circle design snaps onto the door corner, rather than hooking onto it as your original roller does. The new style can be a bit trickier to install but is less likely to accidentally detach from the corner.