the walmart bmx chain is NOT 415!
I have just built a bike with a 415 chain, and will send you some links if you PM me. I'll save them just for you.
I'll only ask for you to send the postage amount if its over $5.
(if you're in US, its probably $1)
I tried the Walmart BMX chain on it, and it worked on the engine cog, but was very tight fit on the wheel cog. It is definitely NOT the same! The difference is longer pins. You can see the spaces between the side links and the rollers.
Mine came with the grubee kit. I have 5 links counting the inside plate as a link.