The bolt on Grinds were 34" for the 4 strings, 35" scale for 5 strings. 18 months later when the Grind was revamped as a neck-through bass, the 4, 5 & 6 string models all were 35" scale length. Peavey being Peavey both versions of the TL-5, another neck through model, basses were 34" scale length. Of the US production Cirrus, they again were all 35" scale except for, Peavey being Peavey, The 2007 bolt-on Cirrus went 34" for 4 string/35" for 5 string π
You're right about Zepher/C-5 being 34" scale length but dead wrong regarding it's timing. Cirrus sales went live Q1 of 1997, Zephyr/C-series didn't arrive until 1999.