I'm asking is because someone installed GD's spacers on a 2+2TT and he started to get some driveshaft vibrations, but soon as the top collars were installed the vibrations went away. With only the bottom collar/spacers on the 2+2, he guessed the angle of the driveshaft was somehow compromised, but I have no problems on my 2+0, but just curious if the top collars would help some if any on 2+0, thanks