I would think there is no one "correct" height of the wheel well lip from the ground. We have too many variables:
- rubber spring pad thickness
- height of springs (incorrect replacements, heavy duty springs, etc.)
- tire dimensions that people select
- tire pressure at the time of measurement
- the sub-frame mount condition
How can we all agree that one measurement can be correct and we should all strive to achieve it?
Looking at the three pictures of the mounts in the previous post, I would think we need to measure the mount itself to determine if it is failed or good. Maybe put a jack stand under the sub-frame cross member to keep the weight of the body on the sub-frame, remove front tires, and measure something like this distance shown in pic? According to these two pics, one mount is old and collapsed and one is new and in proper position. I wonder if these pics were taken with the sub-frame supported?