I've had a 48"in Hi lift for yrs. Thinking on getting one for my 520 but the 36" or the 42" ( due to weight and ease of use) , suggestions on what works real world, including mount points with factory hard top installed, please. Thank you . Just received this Hi lift add-on, I think it has worthwhile added features over the original part. SHOOTING tie in - As I was looking at it , it hit me that this also had another , to me a very important use ,injury and age has weakened my shooting arm. This 4+ lbs part I use as physical therapy tool to strengthen and exercise my shooting arm and trigger finger.