Do not get one with a heat sink. It will not fit. look at the bottom of your Thor. Nvidia has a substantial metal heatsink that works well with the “SAMSUNG 990 PRO SSD 4TB PCIe 4.0 M.2 2280”. The silicon padding insulation also peals off of existing 1tb nvme drive and transfers to the new drive. I chose the 990 as it is pcie 4.0. That is same generation pcie as the oem western digital 1tb drive.
990 Item Dimensions L x W x Thickness 3.15"L x 0.87"W x 0.09"Th
PCIe 4.0 x4, NVMe (Gen4)
9100 Item Dimensions L x W x Thickness 3.2"L x 0.9"W x 0.15"Th
PCIe 5.0 x4, NVMe 2.0 (Gen5)