My floorpans (front and rear) cost and labor was $400 for my 76 240D. The 'local welding-guy' did an excellent job!

My welding cost was very low, but in KY almost everyone in the rural areas have welders and experience.

Hope this helps in your pricing quest.

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William
76 240D (W115) - 550K miles
78 300D (W123) - 200K+ miles