Torque Boxes and Subframe Connectors

To stiffen up the frame on my car after all the crazy roof work, I am going to add some torque boxes and subframe connectors. Does anyone have any recommendations on what I need or want in terms of the torque boxes? I found these torque boxes on eBay, but I wasn't certain if this was the best option or not. And just out of curiosity, which of these is the front and which is the rear?

http://www.ebay.com/itm/290883822596?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT

I would also appreciate any advice or recommendations about what to use for subframe connectors. If you have any of these things that you are interested in selling, please let me know. Thanks.