Who can make these cones?Help

I am trying to order 4 brass cones to replace spikes on my Revel Salon.I tried Adona but they could not meet these specs:Threads- 1/2" - 13 , Length - 2"
Please,let me know if you are aware of any other company that make custom threaded brass cones.Thanks a lot for your help.
A machine shop can make anything to spec.
Try audiopoints they offer custom thread sizes. highly regarded brass cones. I need to do the samething let me know how you make out with them.
They are sold through Starr technologies
Mapleshade has their heavyfeet, and accordingly to the website can match any US and metric thread size...