Ok, I eventually figured that out, but why is the port on my receiver so much more bigger, with no notches? will a standard toslink fit in it?

Yes, They say absolutly nothing specific on audio ports.

I really need help determining the type of Toslink I have on my mobo/receiver. If it helps, I have the Asrock Z68 Pro 3 Gen3, and an Accurian ASR-5046. The Toslink on my receiver looks so much more bigger than on my mobo, and I think I have a mini Toslink on my motherboard, but I don't know...