Hi

fwsm(config)# object-group network servers

fwsm(config-network)# network-object host 192.168.x.20

fwsm(config-network)#network-object host 192.168.x.21

... etc.

fwsm(config-network)# network-object host 192.168.x.35

fwsm(config)# access-list restrict permit ip host x.x.x.x object-group servers

fswm(config)# access-group restrict in interface "fw interface"

Couple of things to be aware of

1) You may need NAT translations depending on whether you are using NAT and the security levels of your interfaces.

2) Every access-list has an implicit deny at the end so make sure you add in any other access to the "restrict" acl before applying it.

3) The access-list says permit ip but you could tie this down to more specific tcp and udp ports.

HTH

Jon