2 antique JE Porter Queen barn door rollers w/ 6’ track architectural salvage

a rare pair of authentic JE Porter Queen tandem wheel barn door rollers that are in very good working condition with no chips or crack. The door straps are for doors 1 3/4” inches thick. They come with 4 good working 1/4” diameter bolts with square nuts. The track pc measures 72” by 1 1/4” by 3/16” thick and it is very good and straight. They are painted flat black to make them match the rollers better. This door hardware should not be used on a door weighing over 200 lbs. These door rollers should be rolling good 100 years from now. I will warranty these rollers for 2 years.