I live in the US and I am trying to buy wall anchors online for screwing a cabinet with only one row of legs onto a wall so it doesn't lean over. I should mention that the cabinets are from Ikea (https://www.ikea.com/us/en/p/mackapaer-shoe-storage-cabinet-white-50334751/) and there are holes already in the cabinet for installing into a wall. I just need to find the correct screw and anchors. The distance from the inside of the cabinet to the other side of the wall is about 1.5". The cabinet holes are about 28" apart so they cannot be both screwed into a stud.
For example, an anchor like this says is for #8 screws: https://www.amazon.com/gp/product/B08665MZ7M/ref=ox_sc_act_title_1?smid=A1LQDSIIXH5MHS&psc=1#customerReviews And these anchors are #6 - #12: https://www.amazon.com/gp/product/B0051IAWM2/ref=ewc_pr_img_2?smid=A3RH26VT14A2VF&psc=1
I couldn't find anything after hours of Googling. How do I know the exact #8 screw to buy? I've read that there are fine and coarse threaded screws with different threads per inch. Or should all, say #8 screws, be the same threads per inch unless specified otherwise?