Need education please

Can someone please tell me the engine difference between the 04-07 style black heads and the newer huskys I believe 2010+ (may be off on the year range) in asking about the newer models with red valve covers with motors that look identical to my 05, I'm not talking about the BMW built ones but like the one linked below. The engine looks identical but I notice the clutch case has a sight glass. I'm just curious if any internals are the same or if the sight glass clover would swap? Thanks!

http://4.bp.blogspot.com/_NT2JrGBt_...qTtFrUL8/s1600/2009_Husqvarna-SM450RR 111.jpg

2004-2010 are essentially the same motors with updates thru the years. That clutch cover holds a little more oil than your 2005.

So would the clutch cover that has the sight glass on the newer bikes fit? By clutch cover I mean side case as it's built into the whole case

Yes it should.

Went to fuel injected circa 2007/2008. Apart from the above only minor mods.