Look at saguaro recovery shackles
If your able to fab up brackets ( the difficult part) you may be able to make complete recovery points and just buy shackles.
It's common to see tow equipment get mixed up with recovery equipment.
But tow points only has to move rolling weight.
Recovery is pulling a vehicle though mud and if snatch straps are used it can be 3 or 4 times the vehicles weight to break it free
You'll need at lease 3 bolts per side
If your making own brackets you can use another steel piece so your making a sandwich on chassis rail.
You might get some better ideas looking at how steel bumpers attach.
If you do make your own do a write up with. Photos.
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