cruse control with a manual tranny

I don't remember the name of the kit, hell they may even be gone by now.
I had a cruise control on my 66 falcon three speed manual years ago so I know they still make them.
I do remember that the instructions said "Only use the cruise control in high gear."

There are some on ebay here
http://www.ebay.com/sch/i.html?_sacat=0&_kw=cruise+control+manual+trans

Kinda pricey
I remember mine being about 75 bucks.