Hi there,
Thanks for reaching out with your question!
While we are happy to explore options for our customers in regards to parts, this particular grounding finger isn't something that we carry. I'm sorry about that! We just aren't set up to get those from our recycled parts supplier at this time.
I know it may seem pricey, depending on the rate the 4S is going for, but have you considered purchasing a broken 4S on a site like eBay, and then harvesting the grounding finger you need from the device? That might be a good way to source one, and doesn't run the risk of it being damaged in transit.
Also, a quick search on a different popular iPhone parts online store shows me that the grounding finger might be included in a set they have called iPhone 4S EMI shield kit! I haven't ever personally ordered anything from them, so I don't want to speak for iFixit regarding the quality of their parts or service, but you might want to check out PowerBookMedic.com.
Best of luck!
