What size/width slot is required for pushing the plastic edge into?

Not sure what width you are asking about. If you are talking about the channel it goes into it is pretty much standard size which is a groove you press the flange into. The only width/gap you need to make sure of is the door to the frame which is about 5/8. Close your door and measure the spacing. I used this to replace the original of 37 years old and it fit like a charm. Very satisfied, looks good and will stop any air leaks. Hope this helps.

The groove you press the flange into should be installed first, because regular doors do not have it, right?

Actually our door had a groove and we just replaced the old stripping that the cats had shredded. Easy and worked great

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Fingwerk 40フィートウェザーストリップドアシールストリップ自己粘着バッキング D型ゴム製ウェザーストリップドアフレーム用大きな隙間用サイズに簡単にカットできます(ブラック)

Fingwerk 40フィートウェザーストリップドアシールストリップ自己粘着バッキング D型ゴム製ウェザーストリップドアフレーム用大きな隙間用サイズに簡単にカットできます(ブラック)

Product ID: 745685682

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Details

Brand
Fingwerk
Material
ゴム
Color
ブラックD型。
Product Dimensions
12.19L x 0.01W
Item Thickness
0.23 Inches

📏40 feet length for extensive coverage

❄️Durable rubber resists freezing & cracking

🛠️Self-adhesive backing for easy installation

Description

🚪 Seal in comfort, seal out the chaos!

ALL WEATHER DURABILITY - Flexible rubber withstands extreme temperatures without cracking or freezing
MULTI PURPOSE PROTECTION - Blocks drafts, dust, noise, and wear on doors and windows for year-round comfort
EFFORTLESS DIY INSTALLATION - Peel-and-stick adhesive ensures a secure, no-fuss seal in minutes
SEAL EVERY GAP WITH PRECISION - Cut-to-fit 40ft strip covers gaps from 2.5 to 5.5mm effortlessly
CUSTOMIZABLE FIT FOR ANY FRAME - Easily trim and bend to perfectly contour any door or window shape

The Fingwerk 40-foot D-shaped rubber weatherstrip features a self-adhesive backing for quick installation and flexible durability that resists freezing and cracking. Designed to seal gaps between 2.5 to 5.5mm, it effectively blocks drafts, dust, noise, and wear on doors and windows, enhancing home comfort and energy efficiency. Easily cut and shaped to fit any frame, this black weatherstrip is a versatile, long-lasting solution for year-round protection.