Re: Riser Boot from !!! Home Depo!!
Since everyone has jumped on your case about it, I guess I'll offer this. When I removed my exhaust boots they were quite thick, so make sure you find a replacement with some decent sidewall to it. As for safety, I have no idea if the rubber used by Merc is specially made to prevent fire in the case of overheat. Either way, we're talking rubber, here. No rubber stands up against heat, Merc or not.
If it means the difference between boating and not, I'd do it. Just try to order the correct one when you can. You can always buy one used (junk yard or ebay) as well. It's just rubber, and my boots are 19 years old and still kicking.
It is your boat, you can do as you wish.