HELP--- I need 1/4" - 20 thread rack feet for Billy Bags stand up rack ONLY M6 online

 Hello, I have a Billy Bags audio rack, and I am in need of feet for it.

The problem is: The thread insert is 1/4" - 20 thread, and the problem I am having is that most feet I see are M6 (real headache)

1.) Is there a thread adapter to take M6 to 1/4" - 20
2.) Any recommendations for feet that have 1/4"--20 thread

The thread insert is recessed a little bit up into the support poles.

The diameter of the poles is right at 1.5”.... so any feet that are 1.5” I will probably need a heavy duty metal washer in between.

The weight of the entire rack including gear is 250-280 pounds

Preferably spiked feet.

Preferably black, gunmetal, black chrome… you get the point.

Perhaps with some gold highlights is fine with me.

Mainly I just need something that’s 1/4” 20

Thanks for the help

See attached pictures and link to google photos

https://drive.google.com/open?id=1zpiwBGx4oaQuIVhoV-28uLB_s_RHvF9t