Upvc door panel insert with 4mm mdf insert. Much cheaper (and easier) than replacing the whole door. I removed this and installed the new one myself. I'm no expert - just a keen DIY'er.
eBay
Car Door Interior Panel Iron Steel Clips Fixed Buckle Clip Accessories for Tesla Model 3 X S Y Auto Fastener Clip
Aliexpress UK
Please note this item is an infill door panel without frame it can be cut down in size, BRAND-NEW HALF DOOR PANEL, USED FOR HALF & HALF DOORS WITH MID-RAIL, ITEM NUMBER & SIZES ARE IN THE TITLE. LOCAL DELIVERY, Up to 80 Miles Radius of BD19 3LJ, £2 per mile one way, Minimum charge £20. IMPORTANT NOTICE: WE ARE CLOSED ON WEEKENDS & MONDAYS. COLLECTIONS ARE STRICTLY BY APPOINTMENT ONLY PLEASE MAKE CONTACT FOR AVAILABLE OPENING TIMES, PLEASE TAKE SOME TIME TO VIEW OUR EBAY SHOP THANKS FOR LOOKING.
eBay
New 4pcs Auto Car Radio Panel Door Clip Trim Dash For Volkswagen VW POLO cc Tiguan Passat B5 B6 B7 Golf MK6 Jetta MK5 MK6
Aliexpress UK
White UPVC Door Panel Shiplap detail with top glazed insert (clear glass) 575mm W x 1678mm H x 28mm thick, with MDF core
eBay
Real Black Alcantara Trims For Tesla Model 3/Y Interior Decoration-Dashboard&Door Trim Modification Cover Decor Adhensive Panel
Aliexpress UK
Please note this item is an infill door panel without frame it can be cut down in size, BRAND-NEW HALF DOOR PANEL, USED FOR HALF & HALF DOORS WITH MID-RAIL, ITEM NUMBER & SIZES ARE IN THE TITLE. LOCAL DELIVERY, Up to 80 Miles Radius of BD19 3LJ, £2 per mile one way, Minimum charge £20. IMPORTANT NOTICE: WE ARE CLOSED ON WEEKENDS & MONDAYS. COLLECTIONS ARE STRICTLY BY APPOINTMENT ONLY PLEASE MAKE CONTACT FOR AVAILABLE OPENING TIMES, PLEASE TAKE SOME TIME TO VIEW OUR EBAY SHOP THANKS FOR LOOKING.
eBay
For Volkswagen Polo 2002-2010 Interior Central Control Panel Door Handle 5D Carbon Fiber Stickers Decals Car styling Accessorie
Aliexpress UK
Upvc door panel in white with inset glass good condition
eBay
4/1pcs Car Door Clip Car Disassembly Tools Set DVD Stereo Refit Kits Interior Plastic Trim Panel Dashboard Removal Tool
Aliexpress UK
UPVC Door Panel, 7016 Grey On Grey, No Letterbox, 28mm, 671 X 1746. Message for collection details and payment methods before ordering.
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Car Detailing Brush Set, 5 Pack Car Purple Detail Brushes for Car Interior or Exterior, Wheels, Engine Compartment, Door Panels
Aliexpress UK
MDF Reinforced.
eBay
Stainless Steel Car Sticker for Nissan Kicks 2017-2021 Interior Inner Door Handle Bowl Ring Cover Trims Frame Panel Accessories
Aliexpress UK
UPVC DOOR PANEL ( HALF PANEL) LIGHT OAK on WHITE 28mm RE-INFORCED BRAND NEW ( still got protective film on ) 638 X 948 mm COLLECTION ONLY.
eBay
For Mercedes Benz E Class W213 C Class W205 GLC X253 Car Accessories Door Panel Seat Adjustment Button Switch Cover Trim Sticker
Aliexpress UK