The green ones are for 44 caliber bullets. If you bought the bullets I linked you to then you need sabots for 45 caliber bullets.The two below are the ones you need. The top is the HPH-12 and the bottom is HPH-24. Whichever sabot loads and shoots the best is the one you want.

Black 50 Cal. Rifle
50 Cal. Rifle .451 - .452 Bullet
$10.75

Black 50 Cal. Rifle HPH/24
50 Cal. Rifle .451 - .452 Bullet
$10.75