Not sure what these look like (as in model part design), but I have fixed truck side frames using a piece of brass sheet (for backing/joint) and some epoxy. Cut the brass to hide behind the side frame, mix some 2-part epoxy, epoxy the brass to the back of the parts, bridging them (also put some in the broken "faces" of the frame), place the truck in a well-supported position. Let cure 24 hours, file off any excess epoxy, re-mount on loco.
This may not help here at all - but who knows what the future holds?