I'm honored to help!
I think your go-to constructor statement will be one of these (found here):
for page buffer, size = 128 bytes
U8G2_SH1106_128X64_NONAME_1_4W_SW_SPI(U8G2_R0, clock, data, cs, dc [, reset])
for page buffer, size = 256 bytes
U8G2_SH1106_128X64_NONAME_2_4W_SW_SPI(U8G2_R0...