Work and play ext bolts

[Kennyw]

I’m having trouble finding the fasteners used in my 2015 work and play. Specifically the torx- pan head- 3/8” bolts with the little plastic washers.
Some call them million mile bolts.
Any idea what they are and where to get them?

[Kennyw]

Steel Pan Head Machine Screw, Black Oxide Finish, Meets ASME B18.6.3, T30 Star Drive, 1/4"-20 Thread Size, 1-1/4" Length, Fully Threaded, Imported (Pack of 25)