A833 od questions

Hey all, i recent got a 833 od transmission with the aluminum case. It’s the proper 12.5” tail shaft and it has a ITM shift mechanism on it but the linkages have been removed. I was looking on brewers yesterday and they have a hurst set for the od transmission however it states that it doesn’t work with all aluminum cased transmissions. Would anyone know where to get linkages for the itm shifter or what I would need to do to make sure the new hurst shifter would work? I planned on calling brewers this week to talk to them but I was just looking for some insight. Thanks!