SSH port forwarding with multiple remote IPs

Okay, here's my question.

I have three Raspberry Pi's (basically mini LEBs) hosted in my cupboard. I have a VPS with Crissic Solutions with three IPv4 IPs.

For example, for SSH, what I want happening is the following:

Raspberry Pi No.1 SSH (192.168.1.17:22) -> xx.xxx.xxx.01:22
Raspberry Pi No.2 SSH (192.168.1.18:22) -> xx.xxx.xxx.02:22
Raspberry Pi No.3 SSH (192.168.1.19:22) -> xx.xxx.xxx.03:22

I only want each local RasPi to be reachable on one IP of the remote VPS.

Anyone know how to or tried this? I've already exhausted my Google-fu.

Thanks!