OK, which cover are you guys taliing about? The one cover over the hole for the jack? If it is, the part number is SG44 WL8AA (that came from my parts book)
If it's the small flat cover that fits inside the compartment on the left, I think the part number is 140800.2 (at least that's the number on the sticker that's stuck on mine).
Neither number works on that site posted above. [:I]
Other numbers and "things" printed on the under side of that cover are:
1605
57584
>HCPP<
CAV#2
OST25TRMAA-A-V1
Hope some of that helps.