the norbco headlocks are very nice, have a friend that has had them for several years. Very quiet... They have rubber around some of the moving parts so you dont hear the clanking when the cattle go in and out of them.... would be nice if the barn was near the house... One piece of advice I got when looking at these is to make sure the the bottom swings all the way over... if an animal goes down its head doesnt get stuck.... Norbco headlocks do this.... they run about $50 bucks a hole for the big ones....
They do have a "small", i dont have specs, but the medium ones are recommended for animals from 500 to 900 lbs... hope this helps