I personally went with G Skill Flare for my Ryzen: https://www.gskill.com/product/165/396/1665021601/F5-5200J3636C16GX2-FX5
It is 33mm which makes it 1mm taller than what Dan has recommended:
https://smallformfactor.net/forum/threads/dan-c4-sfx.12329/post-267684
He is exactly right; 32mm is...