The rear beam doesn't carry much load if you need to save money you could weld patches on the front beam and use it as the rear beam, you could even use the existing tramp arrangement and lace to the new front beam
With all the holes in the rear beam it's load carrying abilities may be not sufficient.
Yep I hope that's how my post reads throw away the old rear beam, weld some patches on the front beam if it's straight then use that as the new rear beam and buy a new front beam. I wouldn't drill the holes under the old beam I would put the bolts through the traveller then put a spanner on a long thin pole to tighten the nuts inside the beam
