pretty sure the top set are larger.

cut your old ones off with a sharp razor, if you try to roll them off the tips tend to break off. then oil the new o rings and roll them on.

make sure the injector holes in the lim are clean, i used Q tips and sprayed brake cleaner into the cap then dip the q tips and wipe the injectors out. might need a lot of q tips, i went through maybe 30 of em.

then make sure the o rings are lubed with oil, and push them back in the lim.