New Wheels Installed
Below are the photos with the new Replika 18x8 (Et 45) wheels on my 2018 GTI Autobahn. First photo is the stock wheels for comparison. Look of the car is totally changed (for the better I think). Can definitely notice the difference between the stock 49 offset and the new 45 offset with the 1/2 inch wider rim.
And no, the stock VW center cap did not fit. The stock cap is 66 mm overall OD, with the teeth OD of 56 mm, and a clip OD of 57 mm.
The new wheel cap was 66 mm OD, 56 mm teeth OD, but 59 mm clip OD.
So the stock cap fit in the opening perfectly, but with no grip as the clip OD was the size of the opening. I first searched the internet for different size stock caps, but came up empty for what I needed. Next I looked into stickers, but too cheesy looking. Plus the 2018 cap has dimples, the stickers I saw were smooth (black part).
I looked through this forum for some ideas how to make the stock caps fit , but nothing concrete. One person used rubber bands, which I tried, but was worried the cold winters would rapidly deteriorate the cheap rubber.
My solution was to use electrical heat shrink tubing around the four clips. I used two layers to obtain the same 59 mm OD as new rim cap. This is great because the tubing shrinks tight around the clips, and had an adhesive to really grip it. They seem to fit tight, at least as tight as the stock caps did on the stock rims. I added some photos of this as well for others who have the same issue and want an easy way to make it work.