I could probably clean it up but it would be pretty pitted, so I've had some replacement parts water-jet cut from aluminium:
I filed a 45 degree chamfer on the parts, to make a groove to retain the Durafix aluminium rod once molten, then clamped them into position, with a piece of square steel to hold everything true and to retain the heat, as the workshop was at about 5 degrees

Once the part was fixed I filed off the bulk of the overfill and then finished on the Proxxon disc sander to get a nice flat and true finish.
Here's the two parts together:
All that's left is to drill the mounting holes and some clearance holes for the idler fillet mounting bolts.
The steel part weighs 850g, whereas the aluminium one weighs just 307g, so over half a kilo of weight saved in just one piece.
Adrian.