The holes aren't the only means to match a correct fit replacement foot for MacBook Air.
As the rest of the MB/Air has more information in/on it, which can help more than that.
• Identify your MacBook Air model - Apple Support
https://support.apple.com/en-us/HT201862
"Use this information to find out which MacBookAir you have, & where it fits in the
history of MacBookAir. Your Mac provides several tools to help you identify it...
The simplest is 'About This Mac,' available by choosing About This Mac from Apple
menu in the upper-left corner of your screen..." ~ (this page doesn't show oldest.)
• Mac Serial Number Info - Lookup your Apple Serial Number
www.powerbookmedic.com/identify-mac-serial.php
The above site (incl parts) may also have 'correct feet' for your exact model macbook air.
• Lookup Mac Specs By Serial Number, Order, Model & EMC Number, Model ID - everymac (macbook/air)
https://everymac.com/ultimate-mac-lookup/?search_keywords=A1304
Usually an Apple authorized service of independent shop who may also be reseller
could be a place to ask. Online, if you locate 'correct identifiers' on your build model
year of MacBook Air; more likely could get an exact match for a replacement set.
{.Expect to get at least four; since these animals don't usually walk on their hands only.}
For entire look into all MacBook Air models built so far, see this site page; many exist:
• Apple MacBook Air Specs (ALL MacBook-Air Tech Specs) - everymac
https://everymac.com/systems/apple/macbook-air/index-macbook-air.html