If you look at your original 1970 support you will see 2 buckets spot welded to the face of it, these are not present on a 1967-68 Chevy support, if you remove these from your 70 support and attach them to the 67-68 it will work in the 1970 truck, there will be unused holes on the bottom front of the 67-68 core support though as the 67-68 used a gravel deflector there not present on 69-72 supports.
GMCPaul
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