If your looking to save some money there is one that works well for me after I made a couple of cheap mods to it. Maybe your strong enough to use it as is? (http://www.summitracing.com/parts/otc-4572/overview/
) I wouldn't pay much attention to their description, or if you figure out how to use it with the heads installed, show me!
Its similar to the (http://www.summitracing.com/parts/wmr-w89409/overview/
) , but seems much stronger, or at least it worked for some roller beehives that the other wouldn't because it flexed too much(jaws spread).
I drilled two holes(1/4") in the handle close to the middle of its width. Got a piece of 3/4" alum bar stock about 12" long that was in the scrap pile at work. Drilled a 1/4" hole in it. Bolted it on and drilled another hole with the hande as a guide. Got a piece of 1" pipe at Lowes for less than $5 to use as an extension. Works great. Albeit a little work, beats spending $150 for something that you only use in a blue moon, at least it was for me.