help with picture

Im trying to photoshop some Cragar 397-Series Black Soft 8 Wheel on it, to see what it would look like. I cant figure out how to do it good enough for a decent comparison. Thanks if you can help

 

[Tbars4]

..I don't know a thing about how to do it but while I was waiting, I would look here for answers..
http://www.explorerforum.com/forums/forumdisplay.php?f=142

 

[scx89]

This is the best I could do lol thats why I need some help.

 

[Paraphoe]

Here you go boss.

 

[scx89]

Awesome thank you soo much!