As said these won't fit a T5 or 6 with the normal roof these have been designed for a poptop equipped van with a top cupboard fitted. For best looks I would carpet to match the rest of your interior.
eBay
6.5 Inch Car Speaker Kit High-quality Two-way Car Audio Modification 120W Front Door Speaker Kit 1 Set Universal Car Speaker
Aliexpress UK
3D Printed Custom Speaker Pod BLACK. Angled at 45 degrees to create more improved sound. Takes a 5" Speaker (Not Supplied). Note Pods are printed in BLACK.
eBay
2X Car Mini Dome Tweeter Car Speaker Universal High Efficiency Loudspeaker Loud Speaker Super Power Audio Sound Car Tweeters
Aliexpress UK
Vauxhall Astra H: 2005 - 2010. A: You can certainly use your factory grilles with your new speakers. Pioneer TS-G1720F Car speakers - 6.5" ( 17cm ) Coaxial Speakers 300W. Along with the Pioneer speakers you will also receive the needed speaker adapter pods for your car, so that the speakers can be fitted to the door.
eBay
2 Way Car Audio Speaker 12v Max 120W Car Component Speaker 6.5 Inch Sound System Car Door Speaker Set
Aliexpress UK
The Caliber speakers combine stunning design and performance in an end product which sets a new edge against the competition. Caliber Bass Reflex Speakers. range: 150Hz - 21kHz. For car audio enthusiasts, Car Audio Warehouse is the place to be.
eBay
Car Tweeter Car Speaker Universal High Efficiency Speaker Super Loudspeaker Sound Car Tweeter Kit
Aliexpress UK
Car Speakers. Pod Speakers. Power 160 Watts per Pair. End of Line Clearout. Power 80 Watts per speaker. Input power 40 Watts per Speaker. RMS power 25 Watts. Pick Your Car.
eBay
GP650 high-quality 6.5-inch car speaker 180W HIFI car audio set stereo high pitched speaker mid bass speaker car subwoofer
Aliexpress UK
They mount on any flat surface and can be painted or wrapped for a perfect match to the vehicle's interior for a nearly invisible install. The angular design directs sound towards the driver and passenger for perfect stereo imaging.
eBay
3.5-inch car mounted same point sound source mid-range speaker, car center speaker, tweeter, car mounted coaxial speaker
Aliexpress UK
3D Printed Custom Speaker Pod. Speaker Mount hole is 5mm solid thick to allow for screws. Remaining pod is plastic grid infilled with 1.6mm thick side walls. Angled at 45 degrees to create more improved sound.
eBay
Car Speaker Ring Self Adhesive Car Speaker Ring Foam Baffles Car 6.5 Inch Stereo Audio Speaker Foam Rings Bass Blockers
Aliexpress UK
Seat Ibiza: 2008 onwards. A: You can certainly use your factory grilles with your new speakers. Pioneer TS-G1720F Car speakers - 6.5" ( 17cm ) Coaxial Speakers 300W. Along with the Pioneer speakers you will also receive the needed speaker adapter pods for your car, so that the speakers can be fitted to the door.
eBay
Car Speaker Cover For Bmw G01 X3 Series High Quality Styling Audio Car Speaker Frame Trim Car Loudspeaker Original Replacement
Aliexpress UK