I recommend checking a free antibody database available at labome.com. With regard to CD8 antibodies, you can follow this link: https://www.labome.com/review/gene/human/CD8A-antibody.html. For instance, BD Biosciences has mouse monoclonal (HIT8a) CD8A antibody (BD Biosciences, 550372) which was used in immunohistochemistry - paraffin section on mouse samples (ref.: Peng et al., Nature 2015). Also, CD8A antibody (PharMingen, SK1) was used in immunocytochemistry on mouse samples (Yu et al. Human Pathol 2014). In addition, Dako CD8A antibody (Dako, C8/144B) was used in immunohistochemistry - paraffin section on mouse samples (Fabro et al., Immunobiology 2015).