I am designing a novel low emission DC/AC inverter and need to simulate my circuit which incorporates a CD4060B and I have an option of using a CD 4020B and also a spice model for CD4017B.
Welcome to ETO!
If you haven't already got the CD4000 model library, download it from the LTspice User Group. It includes the CD4020B model.
My model for the D4060B (which I've named CD4060Bg) is in the attached file. Copy and paste the contents of the file into the CD4000 model library file. I've also attached my symbol file for the CD4060Bg.