If i remeber correctly,the toyota box that has been used in the past,and there are install kits available, is the Landcruiser box. It has basicsly mounts in the same location as the oem box,havent heard much about it recently,i have seen an AD with one install years ago. The most common is the gm saginaw conversion. I have all the needed parts to install on my 54.Someday soon ill get it done!