Hey, Thanks to help from lonepigeon's awesome webpage The Parts of Star Wars, I was able to find a greeble for the ESB Rifle.
I picked up the Revell Visable V8 Kit on ebay for $9.99
That was a great deal considering I see them go from $45 to $65. Here is a pic
It also has a ROTJ stock plate among a ton of other Star Wars items, http://www.partsofsw.com/v8parts.htm
Here is a pic of it: