Model A frames

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I posted a question on another site, but will try here: What is a good reference to differentiate between Model A frames? I just picked up three and there are differences in steering (left side and both sides); what I assume to be the emergency brake cross shaft; holes in the top of the center cross member plus possible others I may have missed. All three go back fairly straight and then flare out after the center cross member. What frame is required for a '29 body? Thanks in advance for any help I receive here. The previous postings about frame drawings were great, but don't seem to answer all of the questions.