What size Solaris are you looking at?
A medium has a 100mm head tube which is the same as my Mosaic. If you’re looking at a medium up then there should be no issues. Even a small has a 95mm headtube, so only 5mm difference.
Here is a pic of mine with the 100mm head tube running a 2013 Cannondale Lefty 100 Carbon XLR 100mm and Lefty-4-All steerer.
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IMG_0060[/url] by Ample Brew[/url], on Flickr
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IMG_0050[/url] by Ample Brew[/url], on Flickr
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IMG_0052[/url] by Ample Brew[/url], on Flickr