spark plug connector

[tbenner]

I am looking forward to changing my spark plugs this weekend. Fastlane only lists one plug for my 95 E320 so that will be easy. Since I'll be in there anyway I was going to also change the 3 spark plug connectors as these are apparently prone to failure.

There are 3 different ones listed. Two of these look quite similay and the third slightly different. How do I know which is preferred or which to order?

Thanks!