I have a juki ddl8700, and I have a business making waterproof bags, I bought needles that I thought was going to fit, and I was wrong!!! The last needle that fits, just broke and I have 4 more orders to complete SOON, Please help!!

I have looked on the internet and some reason, cannot find the right needles, I also need help understanding these industrial needle sizes! so many numbers and letters!

Thanks in advance!