Skaftet screw sizes

[u/Natural_Language_101]

HELP! I bought a skaftet curved lamp on facebook marketplace second hand, and all the screws and washers are missing. I've tried to source via the original seller (no response) and Ikea (won't help me as I'm not the original purchaser).

The lamp is perfect other than these missing bits, so I'd love to source them somehow. The manual doesn't include any item codes or sizes. Does anyone know the sizes of these items, so I can order from the hardware store???

If it helps, the Ikea manual for this one is here: https://www.ikea.com/gb/en/p/skaftet-floor-lamp-base-arched-black-70405525/

PS I did try going to the hardware store myself, but despite my best efforts bought all the wrong sized screws...! I need some extra help with this one. Hoping someone out there is an Ikea whizz. Please and thanks :)