Hi
@Aiden Cursiter and welcome to the planet.
welcome to the world of TPD law in the uk where tanks are maximum size of a pethetic 2ml so will amost all have rubber inside to minimise the size.
most videos you would have seen on youtube would of been supplied by china so full size tanks.
i have exactly the same with the vaporesso PM80 with 2ml but luckily cloudstix sell the replacement 4ml pods for my kit but they dont sell the smok replacement pods.
all you can do is either search every supplier and read every discription to see if it mentions 4ml or buy from china where you can get the larger pods no prob but can take 2-4 weeks to arrive.
check out hardware suppliers on post 5
POTV Vendors & Recommended E Liquid Suppliers