"You are the ninth person today to ask about this item sir,but it's not available,as there is no demand for it"
How often do we get treated to this logic these day's?
However,if you search this site,one of the members was offering to make this part to order!!
In the meantime,you can buy a lightweight ferrite ring magnet from a modellers shop etc,that will clamp the disc to the turntable,it works well as a temporary solution.(2 years in my case!)
Regards,
Nick