Tony
BS and Rockford offered many clutch upgrades for the 350 models, these are not interchangeable
with each other. You perhaps have "mixed" up parts. That one plate with the ridge was soon changed
to another "thick" plate with out the ridge, perhaps this is what you need. I do have them in stock.
There is a large combinations of different Hubs, pressure plates, inner plates, special plates, with some
versions using different numbers of friction plates too.
Most attempts centered around trying the make the clutch quieter, in reality they created major problems
for owners, with the many "upgrades"
I will try to do an "Article" on this topic and post it as reference
Hope this helps
Richard Clark