Stupid but easy: Conical or ball seats???

It looks to me like the wheel bolt seats are conical on these cars... but I can't definitively tell because I'm also told that it's visibly subtle and the appear to be conical while ACTUALLY being ball-seats. For contrast, visually my water-cooled Porsches are quite (extremely) obviously ball seats.

But I have some Hill Engineering spacers with longer bolts that (to me visually) appear to be 22mm bolt heads... and quite bloody obviously conical seats. Is there some subtlety I'm missing here?? F430 Spider here.

So which is it???

 

Typed this into chatGPT just now:

Me: ok, you're wrong. The Ferrari F430 requires wheel bolts with tapered seats

ChatGPT said:
No, that's incorrect. The Ferrari F430 uses ball-seat (R14) wheel bolts, not tapered (conical) seats.

Proof That F430 Uses Ball-Seat Bolts:

1. Ferrari OEM Part Number 181291 – This is the standard ball-seat wheel bolt used on the F430, 360, and similar models.
2. Ferrari Factory Wheels Are Designed for Ball-Seat Bolts – The OEM Ferrari BBS and Speedline wheels have rounded lug seats, not conical tapers.
3. Aftermarket Confusion – Some aftermarket wheels may use conical bolts, but factory F430 wheels require ball-seat bolts for proper seating and load distribution.

If your wheels require conical bolts, they are likely aftermarket wheels or replicas. You should check the wheel seat recesses—if they are rounded, they require ball-seat bolts (R14 radius).

Thoughts?

 

Thanks, guys. Thought I was going crazy there for a while. I went with Hill Engineering.