If it is just a driver and not a show car you can make a fairly nice carpet set using standard office type carpet and some time. My bro-in-law has done some nice looking carpet jobs in cars using cheap rolls of carpet.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine