here you go guarddad-
ramp with extension... the arrow points at the rubber shoe that's on the ramp to prevent slippage. you can tell it's slightly raised while without any load.
here's the bottom side of the rhino ramp. make sure you have this shoe when you buy...
here you can see where the 2 screws go on when i attach the extension to the ramp...
i put masking tape on the rhino ramp to make it easier for me to aim where the extension goes to screw it down.
back side of the extension...
side view...sorry about the shadow of the bush...but you get the idea.
ive used this exact setup for over 10yrs now. no issue.
my Z is stock height, no issue clearing the stock diffuser when i had it. my G is pretty low too, no issue. ive not had one car yet that could not clear.