Tabletop-Art bundled together their Isis Tank Conversion Kit as well as 10 of their 25mm round bases to go with it and is saving you a couple bucks in the process.
From the announcement:
Save 5€ by buying a upgrade kit for your transport tank including 25mm bases for the troop.
This set contains everything to equip a complete troop and the transport tank.
10 xTemple of Isis 25mm miniatures bases
1 x Isis – Conversion-Set with additional side panel