My thread may be of help. I coblefabricated mine together for zero dollars.
The Harbor freight engine stands should be extended 9" not 8 like I did! The backbone through the car needs to start at a plate inside the car license plate, go up 4" (or so, weld in place) over the IRS hump, then drop down 4" and continue through the bell housing hole to the front stand. Just weld I used old rusty boat trailer square tube. The stands HF engine stands have to be cut and the top swivels leveled. I just cut them and reset them with a 2"(?) round pipe passing through both stands to ensure they were level with each other and pivoted at the same height above the ground. I’ll have to cut the backbone to get it out of the car when done. Also I lied in that first post. It doesn’t quite clear the stand to roll over completely. I’m a 1/2" short. Just make the extensions 9" not 8 like I did!