Jack stands? Ooo... I just assumed that you wanted to make one of these to raise a corner for tire/wheel work. Are you talking about setting all four corners on jackstands using these?

If I'm putting my worthless butt underneath the car I want my jackstands under something that can't slip out of position. Sixto's picture of jackstand location would be much more substantial.

BTW, sixto, you're missing a few parts out from under the rear.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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