Mike--You're getting the exact same things I am using for a Sherman right now, but I didn't bother with PE, the DML kit comes with a small fret of the necessities. The tracks provided are also correct, if you don't mind individual link tracks (three pieces per link

)
Here's a link that will help you if you want to make your M4A4 very accurate:
M4A4 Kit FAQI know how you feel about buying things over the internet.
The Barrel Store is a Canadian online store, if that makes you more comfortable (shipping shouldn't be too bad either). The online order form is entirely secure, but you can also print out a fax order form. They carry Tank Workshop items, Aber and Eduard, and other companies that will have the stowage you are looking for. If you need to order the Sherman kit itself try
www.militaryhobbies.com, another Canadian based store.
Nic