OPTIMUS LX4 tweeter substitute?

Hello members. Here I am again, always with a question. So...does anyone have experience with a substitute tweeter on the above OPTIMUS LX4 bookshelf speaker? I was hoping for a direct replacement to screw into the existing mounting holes. The Parts Express (paper) catalog used to list drivers by size, mounting etc. If a member has a catalog and would be willing to help me, the mounting distance horiz=3" & vertical is 2 7/16". I enclosed an image. Thank You, civil6.
 

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