Appropriate size Jack Stands?

[Pdwight]

I went by the local HF store and was surprised how sturdy it is made, and along with my 20% off it made a pretty good deal. They had one mounted on a high lift jack and it seemed very sturdy. The jack had a lift height printed on it of 23 3/4 inches ( or somewhere there close). This with the lift of the arm/brace or whatever you want to call it should give you a lift height of well over 25 inches this would give a lot of working room at a very reasonable cost. Two jacks and two arms at less than $400, my question to anyone who has and has used one of these is will it go under our P Cars with the low profile jack ???

and is 25 to 27 inches enough to pull a transmission....if so this is a good alternative to a inexpensive lift. If this does work out and I eventually buy the jacks I would raise it to height and then place jack stands at 4 corners, even I would feel safe under this.