1. How old is the building? If prior to 1980, the product is no longer available. Go to the catalog and look for a new product...nothing is a retrofit.
2. If closer was manufactured after 1980...what is the size of the closer? Approximately 13" long = 608 Approximately 17-1/2" long = 700/800 Series
3. 608 and 700/800 parts (click here)