electric trunk release

I bought my 70 Swinger 340 in 2006, and it had remote trunk opener under the dash on the left side. I assumed it was an after market addition, because I could find no info for it being a factory option. I assumed it may have been installed by the dealer. No codes on my build sheet, either. It's all electric, with a big solenoid mounted in the trunk. The lock cylinder was modified, too. The lock tail shaft was shortened, so you couldn't open it with the key, only the switch under the dash. I'll dig through 15 years of crap to look for it. I don't throw much away, so I know I still have it somewhere. Paul.