Will this fit on a 2006 yfz 450?

no it will not and if you buy make sure seal around glass is sealed will leak

Is there a way I can get the black with yellow on the inside?

sucks 2012 raptor 700 is gold an black would be sickkkkkkkkkk

Will this fit a 2008 raptor 700R?

To be honest, I know there were some design changes from 08 to 09, but I could not tell you. As far as I know, it should be, but best way is to look up the part numbers and see if they match.

Brand	NICECNC
Color	Black
Material	Aluminum
Exterior Finish	Aluminum
Vehicle Service Type	All-Terrain-Vehicles
Item Weight	0.14 Kilograms
Closure Type	Twist-On
Manufacturer	NICECNC
Vehicle Fitment Note	Yamaha Raptor 700R models YFM700RW, YFM700RSL, YFM700RSE, and YFM700R, as well as Raptor 700 models YFM700 and YFM700R, produced between 2009 and 2023.
Model	Compatible with Yamaha Raptor 700
Item Weight	4.8 ounces
Package Dimensions	6 x 5 x 2 inches
Item model number	NICECNC3146N00126
Manufacturer Part Number	NICECNC3146N00126

NICECNC Transparent Oil Filtre Cap Compatible with Yamaha Raptor 700 2013 2015-2026, Raptor 700R 2009, 2011-2026, Raptor 700R SE 2010-2026 Black

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