Memory 32 g for Synology DiskStation DS1821+ 8-Bay NAS Enclosure, 4-Core 2.2 GHz, 4 GB RAM, No HDD

[Enquiries]

I am confused about which 32 G memory to buy for my 1821+. This Crucial RAM 32GB DDR4 2666 MHz CL19 Laptop Memory CT32G4SFD8266 is $103 US on Amazon (link below). But there is a 32GB Kit (16GBx2) Dual Rank option which might be the one?
Your Kingston link went to a 16 G version. But I think you mean Kingston Branded Memory 32GB DDR4 2666MHz SODIMM KCP426SD8/32 Notebook Memory (link is below): $118 US
Quality matters more than the price.
Recommendations, please? Also, your link if you can get a small commission.
Also I want to get the Synology E10G18-T1 10GbE PCIe Expansion Card or something similar. I thought I saw one with TWO ports which might be better, as I need to connect to a ThunderBay RAID as well as the router. Perhaps I need a switch?
Thanks in advance.

[ed]

Yes, you will need to look for RAM 32GB 260-Pin DDR4-2666 PC4-21300 ECC Sodimm Dual Rank 2Rx8 1.2 volts 2666MHz. https://amzn.to/3QzJk04
There is also alternative RAM mentioned here https://nascompares.com/answer/ds1621and...ch-memory/
And the rest here https://nascompares.com/2021/04/28/synol...lkthrough/

Compatible 10GbE cards:
Synology E10G18-T1 1 x 10GbE RJ45 PCIe 3.0 x4
Synology E10G18-T2 2 x 10GbE RJ45 PCIe 3.0 x8
Synology E10G21-F2 2 x 10GbE SFP+ PCIe 3.0 x8
Synology E25G21-F2 2 x 25GbE SFP28 PCIe 3.0 x8
Intel Ethernet Converged Network Adapter X710-T4 X710-T4 5.05 4 x 10GbE RJ45 PCIe 3.0 x8
Marvell FastLinQ QL41134HLRJ QL41134HLRJ 8.34.15 4 x 10GbE RJ45 PCIe 3.0 x8
Synology (EOL) E10G17-F2 2 x 10GbE SFP+ PCIe 3.0 x8