I met up with my buddy Jim Haynes last weekend and the topic of the T-70/75 type reverse discs came up. He said he was looking into obtaining the molds from the previous supplier so he could have the discs made by another source but unless he can be pretty sure there will be enough demand, the cost will be prohibitive. Since he doesn't get on social media or GTtalk, he wanted me to pass the word along and have people get back to him to give him some idea as to how many discs they would be ordering if/when they become available. You can do this by leaving a message on his answering machine or email. If you use email, use PANZER REVERSE DISC as a heading.
By the way, the reverse tires for the Meteor type tractors are still available but in limited supply. The reverse discs for the T-70/75 tractors are SOLD OUT!