Does anyone have the part number or know where to find replacements for the tires that come in the M05 kits?

At our local track, we have been fighting traction rolling issues for quite some time on carpet with S-Grips and have tried everything to stop this. There a few guys who recently mounted up kit tires and are pulling some of the fastest laps on the track.

That being said, the "kit" tires as we have been referring to them, are starting to look like the best and most consistent solution. Only problem is, nobody knows what tire they are or where to get them.

Can anyone help answer this one for us?