i just switched from my 2001 mustang wheels (15") to cobra wheels (17"), will my speedometer be off or is it fine the way it is? and any good deals online for chrome lug nuts my rusty ones that once hid behind a center cap just wont do now

 

Nah it should be fine the way it is, It might be off a little but nothing noticably. Check Americamuscle.com for the lugnuts.

 

that was easy enough, $25 for 20 chrome lugs