The impeller part number is dependent on the type of water
pump you have not the engine
type. As there are several different versions of 4.108 engines, and as over the years the pump may have been changed it would be helpful if you listed the type of pump and pump model number which should be stamped on the body of the pump. Probably you will be able to get a suitable replacement that is not made by Perkins. However, Trans Atlantic Diesel
in Virginia is a good place for Perkins parts
. Places like Defender and other chandlers online sell impellers. Somewhere on this forum is a link to a place that sells longer life impellers but they are more expensive. I have found that Google
works better when searching this forum than the CF search engine
Welcome to the forum! It is a great resource and most folks are friendly.