16AWG speaker wire is available at any place th sells wire or home improvement stuff. Wal-Mart has it in the electronics section, Lowes and Home Depot have it in the communications/telephone section. If you have a car audio shop, they'll have it too. Don't waste your money on bigger (lower number) wire, 16 is more than adequate for anything that will ever occupy the original holes.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)