Phil...
the 507s fit fairly well and the light pattern definitely helps the low heads. I removed the mount bracket from the rubber housing and plugged rivet holes with black RTV. Then made new mount from 5/8X1/16" flat strap bolted to rear of housing and to the stock holes for DRL. Bent the new mount brachets to angle the light beam down 10 deg from a level bubble. The light beam is wider and helps iluminate the sides of the road where the stock heads leave you in the dark. The color matches halogens, but wouldn't look well with white HIDs IMO.
Heres a pic of them with stock 9007 heads on a foggy night.
Don
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