Old 04-20-20, 09:25 AM
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Originally Posted by Jeff Wills View Post
The "lever boss cover" with the concave bottom (p/n 643 3810-1) comes with Shimano downtube shifters. It fits Campagnolo-style shift lever bosses. The other (p/n 643 4300) has a flat bottom is/was available to fit bikes with a corresponding shift lever boss such as Vitus or Cannondale.

Shimano has kept these parts the same for decades. This PDF for Shimano 600 shifters illustrates the different "lever boss covers" nicely:

The lever boss cover isnít an integral part of the frame. It is an add on. The lever boss may be a braze-on or it may be only bolted through but the cover is only applied to the boss. The SunRace levers come with their own boss that can replace the one that is currently installed on the Cannondale. Given that the SunRace levers are probably Shimano knockoffs, it may even just bolt to the existing boss on the frame.
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