Trick flow rocker and pushrod question

[William741]

I just bought some tfs heads, and they say to use a 6.75" pushrod (I think) w/ their roller rockers. It also says if you use a diff rocker, you need a diff length pushrod. I was just wondering if anyone had used a different rocker and ended up using a different length pushrod than what tfs had recommended. Thanks, Will P.S. Tfs rockers are expensive