IIRC the late idler wheels were smaller diameter and different bolt pattern.
These are from Forgebear for Taigen=
https://www.forgebeartanks.com/store/p2 ... rsion.html
If you read this link at the top of page 77, (3.4.1.25) it mentions in February of 1944 changing from 700mm idler wheel to 600mm idler wheel=
https://porschecarshistory.com/wp-conte ... 0Doyle.pdf