These letters are for you and reflect the whole of your experience while on probation. Write them yourself. Edit them yourself. Just make sure they follow the McMaster Style Guidelines in terms of addressing people, courses etc.
Be specific about your grades and what you've done. Give numbers and dates. Don't use too much emotion (ever).
http://www.mcmaster.ca/opr/html/opr/...le%20guide.pdf
I have been reinstated into university. I followed everything I mentioned.
PM me when you are done. I'll give an OK or not-OK. I won't re-write it for you but I will tell you what motif to communicate better or what not to do.