Hi,
You have a mistake.
HP ProCurve 2524/2512 has a only 5 acceoures that you can use:
Gigabit stacking kit
Gigabit-SX Tranceiver
Gigabit-LX Tranceiver
100/1000-T tranceiver
100-FX SC tranceiver
If you'd like to stack 2 Procurves 2524 over GigaBit, more inexpencive variant is Gigabit Stacking Kit
Best regards!