Spare Wheel
The Kinesis Motorsport K18R wheel would look very good on Maserati. They have a yellow spyder on their site with these wheels at
http://www.kinesismotorsport.com/maserati.htm
They quoted me about $5000 a year ago for a set in 18 inch diameter slightly wider than stock. I am still thinking about it especially since I have one scratched wheel.
By the way, I did buy the spare tire kit for my coupe and it was about $1435 at my local dealer. Includes inflator (compressor), wheel, tire (folding compact spare type), lug nuts, etc. Complete kit. You also need a new trunk floor piece that fits up and over the spare which now sticks up into the trunk a bit. The trunk floor piece is about $150.00.
It's a bit of a rediculous price for what you get but what can I say - my choice to drive the Italian thing.
Still loving the car after 41K miles.