You need to double check on your info. Icom F3101D is a VHF radio, but you are saying they use 450.XXXMHz, UHF.
Those radios will run either NXDN digital or Analog. The repeaters can adapt to whatever input they get, so double check on exactly what mode they are using. If it's 6.25KHz, then it IS digital. Also, 6.25 is the channel bandwidth, not the spacing.
If it is digital:
You will need the input and output frequencies for the repeater, the RAN and the NAC (network access codes, sort of like PL/DPL on analog systems). I hope it goes without saying that you will need to get the OK from the system manager.
If it's analog, you will need the repeater in/out frequencies as well as the PL or DPL tones, and also the system managers OK.
Usually UHF frequency pairs are offset by 5MHz up, so if the repeater output is on, say, 450.000MHz, the repeater input is likely 455.000MHz. There are variations to the rule, but it's usually a good place to start.