Question on 1979 20Ft cc

[ztw4156]

I am in the middle of painting and upgrading my 1979 20. I not sure what you call this part but here goes. The part shields the motor. IT is made fiberglass and prevents sea water from entering the boat from the transom. I would like to remove that peace and put in something more up to date. I have seen some Pic's. of some people's boats on this web site that have changed this part and have gone with something a lot more modern. I guess the question is can you buy this part prefab. Or is this something that my fiberglass man is going to have to make? Thanks any help is appreciated. ZW