These are the plugs recommended by Porsche for use on early air-cooled models, such as the 904, 911S and 911RS. Made in Germany. The W250P21 is a good plug for early 911’s with 9.5:1 to 10.5:1 compression ratio.
These are NOS and in shrink wrapped unopened boxes. Price is for set of six. Quantities are limited as these are NLA.