Unless an ES Berlina or full-option Trevi 2000, usually a full-size steel wheel as a spare I've found, as most Trevi and Berlina were sold with steel wheels 175/70/14. Many had HPE/Coupe Cromadora range alloys (or FPS copies) fitted later in life.
Yes, 185 tyre widths are a bit tight in the recess - but still, no need to use the (usually perished or missing) rubber strap then...
Common third-series Berlina and Trevi alloy wheel option was Cromadora CD-64. The CD-160 fitted to your Trevi always looked sportier and that was the VX wheel choice. (The older style 'ES' set you have refurbished is CD-51)
It's not the wheel that is different, that's a tyre size that's all. Didn't realise sorry. Simple trip to the local breakers should liberate a 185/65 tyre - my local supplies and balances for £10. If it is a problem you can have an original steel with 175-width tyre from my garage.
Correct rolling circumference match would be 185/65/14, not 60. 65-profile ride suits those saloons better than a 60 commonly found on HPE and Coupe, I've found. Lancia supplied Pirelli P6 60-profile as an option, or seen fitted standard to the Hifi Coupe.