According to the leaked US intel from last thread 12 Brigades were generated for the counter offensive. 9 provided for and equipped by the west, 3 by Ukraine. I'll just list them here anyway.

Of those 9 western Brigades.

The first one,can't see the name
90 BMP -Trained By(TB) PL and CZ
13 T64 -TB UKR
17 Tanks(not stated), probably they would be a similar model to the T64 for logistics and training purposes
12 AS-90 -TB GBR
10 2S1 -TB UKR

47BDE

99 M2(Bradley) -TB US
28 T55S -TB UKR
12 M109 -TB US
12 D-30 -TB UKR