What other microscopes use 210mm tube length?

I may be at risk of wearing out my welcome but... I'm still having
trouble trying to salvage an older student type monocular B&L
microscope which I'm assuming has a 210mm tube length. I've been
looking at ebay for used B&L lenses but haven't had much luck... lots
of sellers don't seem to know the TL and I certainly can't help them.

Question: Are there by chance particular microscopes that also have
210mm TL DIN objectives that could be used on this older B&L? I could
certainly use some help.

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