Only other ones I know of are from Billet Specialties.. didn't look "industrial" enough..
Now these are more like it...
http://www.claytonmachine.com/prd_doorh.html
Now if we could get Marquez to make some..
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones:
https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS