Must be a zillion of them around from folks that dropped their spare for a ducted hood, but how much of your time are you going to spend looking for a $10 part? Sig doesn't have year, but I'd suggest:
Honda 74240-SL0-020 (74240SL0020) BOLT, ANCHOR. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com
Different years:
https://www.amayama.com/en/catalogs...-3/chassis-and-transmission-7/tires-rims-1379
Look around amayama, I bet you find more parts you need & make it worth the shipping. Almost everyone has their spare tire rim scratched to heck because they're missing:
Honda 74174-SL0-000 (74174SL0000) CUSHION, SPACE SAVER TIRE. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com
Honda 74176-SL0-010 (74176SL0010) CAP, SPACE SAVER TIRE HOLDER PIPE. New & genuine Japanese car parts. Fast shipping. Low prices. Request a quote from Amayama Trading Co. online.
www.amayama.com
How about wind noise (85039-SL0-T00) or in case someone sees you at night, 90625-SL0-000ZA?