Spark Plug Tubes: Question about Transom Plug

[stateofidleness]

Gents,
Going to tackle the spark plug tubes tomorrow and was going to try to stop by Wal-Mart in the morning to see if they had one of those "transom plugs" that seem to be the tool of choice for this job.

I honestly had never heard of that thing before reading up on this DIY, so I want to make sure I get the right thing before diving in. Is this an everyday thing that every Wal-Mart will carry? Are there different sizes that I need to look out for?

Would needle nose pliers do the same job for removal?

Thanks.