felpro rope seals

[billfish]

I have an oil pan gasket set from Felpro #os 2996 c-1 for my 51 ford 8ba. It came with 3 rope seals - 1 thick straight black - 1 thick curved white and 1 thinner straight white. No instructions - I assume the thick black goes in the pan for rear seal, thick curved white is for pan front seal - what is the thin straight white rope for? If I wanted to replace upper rear seal would it be the same as the thick black rope that came with this set?

 

[51 MERC-CT]

The black (graphite infused) rope seal appears to be included as a multiple choice for the rear seal along with the white one.
Don't know of any advantage of using one over the other.

 

[Ross F-1]

In the V8 sets, the black is for one year range, the white for another. May be worth checking with FelPro.

 

[tubman]

"Ross" - You never cease to amaze me!