Center Cap sizes??

Im ordering some Cragar soft 8's 15x8 with 4" BS and wanna get some center caps but not sure on what size i need. they got 3-1/8" diameter, 3.3" diameter and 4-1/4" diameter. need some help on whcih of those i need. thanks

Should be 3.3"


Product Line: Cragar Black Soft 8 Wheels
Rim Diameter (in): 15 in.
Rim Width (in): 8.00 in.
Backspacing (in): 4.000 in.
Offset (mm): -12.00mm
Beadlock Functional: No
Beadlock Included: No
Rim Material: Steel
Center Material: Steel
Wheel Finish: Black
Lug Nut Seat Style: Conical seat
Wheel Construction: 2-piece
Conical Seat Taper: 60 degree
Hub Centric: No
Center Bore Diameter (in): 3.330 in.