You can either buy a tie bar made specifically for this purpose, or use a large galvanized turnbuckle.
I need to get some stuff done now, but if you don't mind waiting a day or so, I will dig out the pieces of a system that I made years ago. I can then take a couple of digital pics and post them here.
No rush... I'd appreciate that. Just curious as to what others have done. Years ago I know this part used to be made. I really don't want a $300 plus hydraulic tie bar system either...lol..lol..