Dell Spare Parts phone number

After a lifetime of upgrading my computer (including the case!) I have decided to take the easy way and when my last one died I bought a Dell earlier this month and have been very pleasantly surprised with my XPS 8950.

The only thing i would like is a second blue hard drive carrier to fit a second hard drive which can then slide into the second hard drive cage.

From browsing the forums it appears that this is not easy to obtain whether new or pre-used. Although there was a Dell Spare Parts phone number in one of the posts about 15 years old this does not seem to go anywhere now. Can anyone suggest a number I can try - preferably in the UK. Thanks for reading!