If I calculated this correctly, that is +/- $20,000.00 in USD. It is high for LA/California dealer pricing per KKB.com. Private party suggests +/- $18K USD. It seems to be a buyers market here. Get an independent PPI, if they will co-operate with you. They appear to be a high end dealer? and the price reflects that IMO.
Ask for a discount. The wheel is on the wrong side......
Leave your heart at home and make a reasonable/low offer and then let them sit on it for a while. How many convertibles are they selling this time of year in Scotland? Those rims are really nice.