This grille is readily available through Chevrolet Parts,but you can get it through some none chevy dealers for near $100.00.
Always could,as they really never stopped producing it.
There is a variation of this grille,but only the early design reflects original foot print.
Early meaning mfd. in the 1970's-early 80's.
Around the late 80's,when reproduction parts began to see a demand,GM outsourced this part overseas,& although it shared the same part #,it is not EXACTLY as the Factory intended.
Look on the original box first to see what it's time period is,for one.
I real Assembly line NOS grille,brought near $800.00 last time I checked.
No Disrespect intended,but are you building a 1970 SS Chevelle from Scratch?
How Bad is this DY LS6?
You are looking for a lot of parts,on a Few websites I see..