Just updated my vehicle park a bit. Added a lot more armored vehicles.
As you know me this is hardly the full list but it might still be interesting.

ML-24 Makk SPG/Tank Destroyers and HK-27 Lehel MBTs are on sale for export. Both are equipped with 105mm guns.
If you have good relations with the League then perhaps you may even acquire HK-48 Zrínyi tank destroyers. Those are quite good for defense.