I found this guy selling 4 bayonets. He wants $250 for all four. He says there from WWII, but one of them are dated (1917 Remington - 21.5 inches long)
Other three I don't know anything about. Here are some pictures. Let me know what you guys think.
Note: there pretty rough shape. I don't know if there German or US?
Also the guy gave me the size of the bayonets
1917 Remington - 21.5"
The other 2 large ones are 20 1/8 in (i believe those are the same)
The small one - 11 1/8 in.