Bracket subassembly and seat assembly

A seat assembly, comprising:

• a seat back frame;
• a support;
• and
• a bracket subassembly connecting said seat back frame to said support, said bracket subassembly including a first bracket having a first attachment feature and a second bracket having a second attachment feature wherein said first attachment feature engages said second attachment feature to lock said bracket subassembly and capture said support between said first bracket and said second bracket, wherein said first bracket includes a body connected to said seat back frame, said first attachment feature includes a flange having a first hook at a first end and a second hook at a second end, said second attachment feature includes a third hook at a third end and a fourth hook at a fourth end, said first hook engages with said third hook and said second hook engages with said fourth hook, said flange is contoured to rest over said support and said second bracket is contoured to rest over said support and said support is a cross car support tube mounted to a motor vehicle by a first mounting bracket and a second mounting bracket.