Steel tube measurments
Here is info from an old post by HarvyRV:
For any one that is interested in making your own lift-spacers, the bolt holes are 8" on center and you need a minimum of 12" of either 2" or 2.5" square tube. The tube should be minimum 3/16" wall thickness. The place that I bought the tubing from (new $9 Incl cutting) also had 3"x 4" tubing which would work also (I was tempted). If anyone might contemplate this, there is no restriction on the width of the spacer. However, any higher than 2.5", I would recommend using 3/4" bolts. I used 5/8-18 grade 8 bolts (4" long 4 1/2" might be better), nuts & lock washers. I double nutted them for safety and torqued them to 150ft #.
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