If anyone is in the market for a real, three hole Borden connector for their Boba helmet, I found a company online that sells them. You're looking to buy part number: 0121.
Here's their site:
I had one in my old MSH2 that I just sold and loved having the "real deal" in there.
Edit... first site I posted wouldn't sell the parts direct as a private sale. The new link has no problem and is easier as you can simply order online as opposed to ordering on the phone like the first link I posted. I'll let everyone know how it goes when I get the parts in.