Anybody know if these F430 rims can fit a 456?

Don't have the offsets on hand with me but spacers are definitely a must. Not too sure about fronts, but rears most prolly need at least a 20mm minimum spacer (preferably type II due to the thickness). FWIW the Novitec 19" wheels for the 550s/575s/456s are actually, correct me if I'm wrong wheels made for the 360s/430s and to counter the positive offset at the rears you need to buy the 25mm spacers for the V12 front engined fitments.

Then again, you have to realize that running 19" on your 456 necessitates a different tyre size than the ones supplied with the said 430 wheels. The 456 tyres in 19" should be 255/35 fronts and 305/30 rears..+/- a few mm in diameter differences... Best if the fronts are 9" and rears 11" respectively, I forgot the data on 430 wheels.. Why? Because even though it's workable, 255 wide fronts optimally works best on a 9" front and 295/305 best on 11/11.5" rears. Otherwise you'd have too much of 'slack' shoulder and handling will be compromised.

IMO, if you like the twin 5 spoker look ala Enzo, Novitec makes the best looking ones and even though they might be a touch heavy, their width front and rear are spot on. 'Jagbuff' has a set on his 456M IIRC...

 

The NovitecRosso are quite heavy (actually very heavy) but not a huge issue considering that this a street car. The biggest problem is getting the rear tires 355/25 which are next to impossible to find since Pirelli only makes them once in a blue moon for the Murcie - I have a set on order since last July and have been told it's another 3 months.... BTW, I know the bolt pattern changed with the 612, 599, vs. the 456, 550, 575, 360 - I would check to see if the 430 was also changed, I may be wrong but better safe than sorry.

 

The offset of the OEM wheels of the 456 are + 50 in the front and + 24.5 in the rear.
The hub center hole is 67mm dia. with 108mm spacing between the bolts.