Those are very difficult to find in good shape. 99 percent of them will be cracked, melted, or in poor overall condition.
You are lucky to have one as nice as that one is. They also made at least 35 different part numbers, and they are color coded per application, which makes finding the right one nearly impossible.
They also don't work nearly as well as the later metal variety, which I prefer to use here instead of the plastic ones, unless we are doing a show quality restoration......Cliff