Replacement Mirrors for Naked Bikes?

[Chriss]

Hi, my GS500 and DRZ400 both have very similar types of mirrors. Rubbish. if I adjust them when going along, it just ends up with the mirror going loose and swinging loose being no use at all.

Is there a way I can change it for a similar type to sports bikes, where they use tightness to hold them in place, rather than a nut and bolt?

Rereading this, it's difficult to explain, hopfully you'll have an idea though.

Thanks in advance.
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TheShaggyDA: I've got 3 or 4 pairs that predate my wife, so at least 11.5 years old.