Looking for these 2 per side, for the 53-58 K body quarter window tracks. 
307555 Washers
280821 Washers (the two washers are leather, so I can make them up if not found)
307554 Studs the stud has a shoulder to "ride" in the channel and stay centered.
UPDATE --
I took a fine thread 5/16 bolt and welded a washer to one end, ground the sides off so it would go into the channel.
I had several windlow channel rollers left from another project, took one and cut the end off that the metal clip goes into, so
I would have the proper distance inside the channel. I think this will work. One difference is that the original bolt is ground flat
on two sides so the window frame holds it in place and it rotates inside the channel as the window is rolled up and down. By
making my washer that way, the washer will act as the "holding guide" and not the window frame. Now, I can either drill out the
window frame holes to 5/16 round or do both sides of the new bolt and round the washer so it can rotate in the channel.
307555 Washers
280821 Washers (the two washers are leather, so I can make them up if not found)
307554 Studs the stud has a shoulder to "ride" in the channel and stay centered.
UPDATE --
I took a fine thread 5/16 bolt and welded a washer to one end, ground the sides off so it would go into the channel.
I had several windlow channel rollers left from another project, took one and cut the end off that the metal clip goes into, so
I would have the proper distance inside the channel. I think this will work. One difference is that the original bolt is ground flat
on two sides so the window frame holds it in place and it rotates inside the channel as the window is rolled up and down. By
making my washer that way, the washer will act as the "holding guide" and not the window frame. Now, I can either drill out the
window frame holes to 5/16 round or do both sides of the new bolt and round the washer so it can rotate in the channel.
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