If you do the shimming and need new shims, don't simply order what you think you need. Go to the dealer with the old shims and the clearance you need to make up.
The way you measure them could be different to the way the factory or the dealer measures them. Even the new ones are sometimes different to what it says on the bag.
Whether you take your own tools or use the dealers, only measure the old and new with the same tools.
I've had too many phone calls about shims i've mailed out saying they are "wrong" for the same reasons.

It's worth replacing the 1/2 rings on the closers before you do any checks. Firstly they can/will break up and secondly, over time they flatten. The excess clearance on the closers can usually be pulled back by simply fitting new 1/2 rings.
Finally, check, check and check again. Too tight and things will wear or even break.