Bought a couple off of eBay for a different project. They are 6.25"L x 1.5"W x 2.25" Tall (deep).
Paid less than $20 for the pair 3-years ago. Just laying around waiting for a project...Got to thinking about the gear leg fairings as a place to mount them.
That lead to this thread to see if anybody has done something like this.
I don't think that will be an issue because the gear legs are down low, out of sight.
I would start by affixing them to your gear legs with tape and at night, see how they look, tail up and tail down. Try them up high on the gear legs and down lower.
If the results are acceptable, then order a new set of fiberglass legs from Van's and mold them in.
One thing I remember from building, there really isn't much room in front of the gear legs, so that may be an issue.
Good luck and please let us know how it works out!