Yes, it looks like a good price, or yes you use the same plug for

leading and trailing?

 

It was two separate answers; so “yes” and “yes”.

 

I've always used different plugs for leading and trailing - I forget the

different numbers (B9EGV and B7EGV?) , but they actually have L and T

written on the plugs.

 

I’m surprised since I think these are mostly used in motorcycles – but you may be talking about different plugs.

 

Al G.