My road bike and two of my mountain bikes have 165mm cranks. I have very short legs and spinning was difficult for me with longer cranks.

My older mountain bike has Truvativ Team Stylo cranks (about 5 years old). They required a different bottom bracket. But I don't think that will help you because I don't think they make them in 165's anymore.

My new mountain bike has Shimano XTRs. I had to order them and they took about 2 weeks to get. Luckily/unluckily for me it took almost 7 months to get my frame, so I had plenty of time to wait.

Some people say that you have less power with shorter cranks. Theoretically and mathematically that is correct (because you have a shorter lever). But for me the advantage of easier spinning outweighs that.