http://www.jegs.com/i/TCI/890/121700/10002/-1

TCI 121700 Reverse Manual VB

http://www.jegs.com/i/Hughes-Performance/512/HP1218/10002/-1?parentProductId=760486

I believe the 1218 is the same as a 1217, but it is a transbrake with external solenoid that screws into the neutral safety switch threaded hole. Old design. You don't show a solenoid or push rod, so they may be missing.