These 1950-1979 Beetle Lower Engine Mount Studs are stock replacement style studs that thread into the lower two case mounting holes in your Type 1 engine case. Each stud measures 10mm x 85mm and have a 1.5 thread.
N145251 studs fit everything except 091 transmission applications. 25hp, 36hp, 40hp 1200cc, 1300cc, 1500cc, and 1600cc engines. You need 2 of these installed into the engine case to mount it to the transaxle.