Unfortunately, yes, you'll need different rockers as noted.You cant shim or adjust around your problem, like Dwayne mentioned, its the actual length of the rocker arm, well, actually the center to center distance of the wheel/shaft.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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