Yes, if there's one thing Wendler talks about nonstop, it's that the assistance work should always be followed exactly as he wrote it and people should never ever customize it according to their health, abilities, and goals.
What are you trying to achieve by doing them - low back strength? Glute/hamstring strength? Low back size? Glute/hamstring size? Different tools will do different jobs.
What days are you putting them on, what does the rest of that day look like, and what's the rest of your training week look like (days, exercises, sets, and reps)?