steel crown unbranded

Hi all,

I am looking for 2 unbranded (=smooth) steel crowns (solid steel or steel capped)

Requirements:

6 - 6.5 mm diameter
wide space for the tube: 3.5 mm or more
thread size 1.00 or 0.95 mm
slightly domed and roughly serrated

Here a photo how the crown should look like:


Offers through PM only please (in order to keep the thread slim)