As the make and model wasn't mentioned, I did wonder if the car in question was some exotic with rear a/r bar - and the D bushes on that are the ones that failed.
Also, if drilling out the broken bolt and fitting new nut and bolt - do they need to be something like 10.9 high tensile automotive grade items as it's for suspension? Or am I being pedantic?
EDIT>>>> Just looked again and it seems the OP is doing the D bushes on the rear. What do the front ones look like? Can't see them in the photos. Wouldn't the tester have had his yellow crayon out and marked failed items?