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Here's one I posted a while back - and then everyone bitched that they could weld one up cheaper, etc. ;-)

http://store.uscartool.com/Mopar-K-Frame-Stand-Drivetrain-Restoration-Tool_p_84.html

Disclaimers:
I have no stake in US Car Tool making money off of this
I could weld my own
I haven't fab'd my own
If you don't have a welder, etc. already, it would be cheaper to buy it than to buy a welder, etc. so you could save money fab'ing your own
I don't need one
I haven't bought one
There are pictures of something like what you asked about

:-)