904 dust cover

I'm looking to find out what the part number is or where to find a dust cover for a 318/904 setup, when i got the car it was missing and would like to get one put on it when the trans comes back from the shop. any help identifying one. I have see them for the 727 trans, is this the same part? Does anyone have one they are looking to "dispose of" cheap?

thanks,
J5