It doesn't matter - the rear has factory 30% anyway I think, unless you have one of those rare fishbowl models - mine has been tinted 15% all around a month after my purchase in December 2011.

The size is 1 1/8" plug inner diameter on the hole - 25.4mm is 1" and 1/8" is 3.175mm so a 28.5mm plug would work if you can find that - I found a plug that was 1 1/8 and it still works great.

For those who are wondering, I think I'm at 2+ or even 3+ years since deleting - have not missed it once even in winter

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards