if by 'front one' you mean the front one on the top that has the eye wires attached to it... then, yes, i have a spare one; as mines been replaced by a qev... if you want to buy a brand new one, look on the exploded diagram of parts in your ION's manual and the e-mail a company that sells them (if you dont know of any then i will give you a couple of addresses) and ask for the code number of that item, and they'll tell you which size thread one you want, as there are only two different sizes...