I have a bad diaphram in my EGR valve and I see that the AC Delco ones are discontinued except for NOS4GN but I have a hard time swallowing $150 for an EGR valve. All the stock replacements shown on the local parts stores sites are either completely wrong or have a universal cover that wont allow me to use the plastic cover which I would like to retain for a stock looking appearance. I did find an AC Delco Part number 214-5355. Its for a 1987 Buick Lesabre. Only difference I see is the vacuum port is 180 degrees out which I can live with by using a longer vac hose. Anyone have any thoughts on this?