I found one that Kenlandrum posted but it was in a different thread also I'm sorry to hear about your hard drive same thing happened to me recently...
anyhow heres the link not sure if u asked for a symbiote logo on its own with a neck dart or for a pattern with a neck dart emblem but heres the pattern anyhow....
No problem. I also just got all the files cnc routed onto molds just like they did in film production. I will be offering urethane casts soon to anybody that needs some for a reasonable price.