tubular k member

Has anyone had any experience with this k member p#52313 Mopar Tubular K-Member for 67-72 A-Body qa1. Product.
$694.95.
Thinking about using one in my 74 dart sport.

Put QA1 one 71 Dart earlier this year no problems...71 Demon has the CAP ...remove deals ...could not tell the difference

http://www.ebay.com/itm/QA1-52313-Tubular-K-Member-/400747599074

http://www.jegs.com/i/QA1/122/52313/10002/-1?parentProductId=2796209

http://www.summitracing.com/parts/hal-52313