Early SB timing chain cover

Hi guys,
happy new year!
I need a new timing chain cover and harmonic damper for my 1968 LA 340.
I would like to get the original style wi5h the separate, bolt on timing indicator on the left side but all i can find is the later style model with the integrated indicator on the right side.
Any recommendation where to buy the early style cover and harmonic damper since the markings need to fit?
Or: is it possible to just convert to the later style cover and harmonic damper?
Thanks!
Chris
Author: admin