How to NAT client VPN IP to specific local subnet IP?

A 3rd party has an Ethernet switch inside our local network that is only allowed to communicate with a specific range of local IPs, lets call it 192.168.1.175-176. They are connected to our Fortigate 100D via client VPN. Is there a way I can have a client VPN user behave as if it's internal IP address is 192.168.1.175 or 176?