Larry,I think the Crosman part you need is 38-128. It Can be used in a variety of Crosman pistols like the 338, 357, and 38T/C. You can order directly from Crosman at 800/724-7486. I believe shipping is a set price of $4 so you might consider ordering more than one seal, or maybe additional parts. Like I said, I think you need 38-128 so maybe someone else can concur. Good luck.