Well, if you know how many inches you need to clear, would be easy to figure out what you need height wise maximum. Other would be get 4 donut spares from the wreckers. If they can handle the weight, and they should, you can't get smaller than that usually, and they normally can't give them away so to speak so maybe can pick up dirt cheap.
(Can you tell I don't like to be told what to do with my property? Yep, I've had a few run-ins here with those who would want everything their way cause they don't like this or that. You should see what I've done with my garden! Gotta push the envelope!)
The beatings will continue until attitudes improve!
HID Quad bi-xenon + foglight retrofit