70-81 trans am hurst shifter

i have a 1980 trans am that i have replaced the 4-bbl 301 and put a stroked 400 in its place.i am still running the stock shifter but my friend has given me a hurst dual gate shifter for this car.i need the plastic top piece for it.keep in mind the thing is made for only this gen camaro and firebird.Anyone know where to get these parts?