He kicked 37, 42, and 37 goals in 1997, 98, and 99, so he probably spent sometime forward those years, although he wouldn't have topped the Brownlow votes in 97 as a full time forward who only kicked 37 goals, so he must have played back a bit that year. 2004 looks to be the only year he didn't venture forward at all.
According to the
teams listed on Wikipedia, which I only just found (don't know why it didn't come back before when I searched): in 1997, Grant was named at CHF, and 98-99 on the bench, probably as a swingman.