Standard Mercury Throttle Replacement
 

I have the standard Mercury throttle that came with my stock 350 mag engine (trim button used with thumb, gear lever under handles). Is there a replacement for such a throttle that works and looks better (ie billet aluminum, etc.?) I may be wrong, but the zero effort throttles require a box to be built out from the side of the boat? Don't know much about these and would appreciate any help. Thanks.