90s Ducatis with a single front disc have a quite nice black plastic cover, held on with 3 bolts. It will fit perfectly on a Yamaha hub, with regards to bolt circle and hole diameter. Not sure about the OD, but it will be close. If building a new wheel, there are other Yamaha models with dedicated single disc hubs, like the XV535 Virago. And the RDs as well, although those may be smaller than XS hubs. At least IMHO, that is even sleeker looking than a nice "beauty cover" . And a bit lighter as well.
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