I just finished dressing up my black engine by covering the stock bolts with black bolt caps. I've added some photos to see what I mean, (including before and after):First attachment is right side with black caps.Next attachment is right side without, for comparison.Next attachment is front caliper with bolt caps.Next attachment is rear caliper wit bolt caps.Last attachment is left side of engine with black caps.I think it looks better with the engine caps. If you do too, and want some of these, they are purchased here: https://www.probolt-usa.com/aluminum-button-insert-m6/Order Aluminum Button Insert M6, AlPColor: Black as this is the size that will fit your engine bolts.Note these are not plastic, they are aluminum and they are made with a rubber gasket on the stem that holds them into place. These come in various colors if you're into something really flashy. These also come in bigger sizes to fit other bolt caps.I also bought some brake caliper bolt caps that also fit over my foot peg mount bolts (see attachments). I got them here: https://www.ebay.com/itm/281971068919?ViewItem=&item=281971068919&v=1&utm_source=unp&utm_medium=email&utm_campaign=RT000090&utm_unptid=&ppid=RT000090&cnac=US&rsta=en_US(en-US)&cust=&unptid=&calc=5cc73ac3dc5a3&unp_tpcid=null&page=main:email:RT000090&pgrp=main:email&e=cl&mchn=em&s=ci&mail=sys&appVersion=1.32.0&xt=104038Black CNC Inner Hole 9mm-12mm Schrauben Motor Bolt Topper Caps Cover For Harley | eBayLast (but not least) I ordered a Testers Black Epoxy pen and used it to paint the tops of some bolts I couldn't reach to put in the caps. This pen is very handy for a black bike quick touch-ups too.Order here:https://www.walmart.com/ip/testors-enamel-paint-marker-gloss-black/189278075