here's a nice looking complete cylinder head assembly off of a 2006:
https://www.ebay.com/itm/2006-88-07-...US!-1#viTabs_0
Although, here's a complete, low-miles 2005 engine for not a whole lot more:
https://www.ebay.com/itm/88-07-2005-...kAAOSwi5VdlN2L
If you live in a bigger-sized city it might be worth the effort to see if there's a motorcycle junkyard/part-out located there. This can get you a cheap whole engine or a complete cylinder head without the cost of shipping.