common to weld a rim blank onto an old center.
remove the old rim as you can. grinder.. sawsall,, cutoff wheel.. plasma cutter.. torch.
I done em all.. torch was the easiest.. then hit it with a grinder a bit to clean up
lay flat and use blocks to prop the center to get it level in new rim.. use other rim as a measurement guide. tack in.. then remeasure.. and check for true all around.. then weld her in.. grind.. paint up and remount and go.