JL Frame Replacement Process & Pics

[Temo]

Hello everyone, I have problem with these front extensions too, can please advice if I have the right part numbers?
68638760AB
68638761AB

Also, these are just extensions, as I see there are some steel parts down of these extension, do they come with extension or they are another parts?

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[2timing]

Those are the correct part numbers. you cut the old rail off, grind out the remaining weld and install the new rail end and weld