Shifter Cable GrommetApplications: K Swapped cars On K swapped cars without heater cores and top mounted shifters, most people seem to pass the shifter cables somewhere through the firewall. Sometimes the existing hole for the heater core is used and sometimes people prefer to drill a new hole slightly lower on the firewall. Either way works fine but you are always left with some ugly gaps around the cables after installation. This is exactly why we designed a special