[Bob Steele]

These wheels from Andymark also come close. (oops Knufire beat me to it!!)

http://www.andymark.com/product-p/am-2647_Blue.htm ( 50A durometer)

Also available in black

http://www.andymark.com/product-p/am-2647_Blk.htm (60A durometer)

and gray

http://www.andymark.com/product-p/am-2647.htm (77A durometer)

"Stealth Wheels" hex hubbed..... 4"

good luck!!