Thanks for the suggestions.Sample parts started coming in today.Dang,if I didn't get lucky.Had to settle for od.of 1.510", but was assured by Isky tech dept. that was an acceptable dimension for that valve spring combo (1.625").The company that supplied me with the locators is Victory 1 Performance,Mooresville NC. 704-799-1955. Very fair price,and large selection. They used a partialy machined blank and finished the inner spring shoulder to my requirements. All dimensions were correct as ordered.Great folks to deal with,willing to take time to help me put this Edelbrock Victor/Big spring thing together. All the larger companies didn't have anything to fill the bill.Mike's B3Racing rocker arm geometry correction kit is the best investment you can make to get the room to pull this off. Moparts member,Jeremiah has a wealth of information on the Victor head/valve spring issue also. Thanks to all these folks. Bill