I replaced the front lower control arm bushings on my '91 190E 2.6. On each arm, one bushing was rubber while the other was metal and rubber. The replacements are all rubber. Of the sets I got, all the replacement bushings look identical except 3 have 2 "nubs" and 1 has 3 "nubs". The three with 2 nubs are marked 124 333 4214. The one with 3 nubs is marked 124 33 4314. Does it matter?