My father wanted me to thank Jamie for how helpful he was in getting the RIGHT thing for me. He was VERY complimentary for the customer service and their knowledge about the parts and speedy delivery.
Kudos to Sparks.
And thanks for my father's UNDERSTANDING of why I was interested (and the assistance of my uncle, who used to race, in explaining WHY they were desired).
Now . . .
When to install . . . ?