You have to be careful with Amazon/eBay caps, as they can be cheap chinesium garbage. I look for name-brand caps when I can and try to get them off eBay, Grainger, or Repairclinic.
You don't need the same model number as the original cap, it just has to have the same voltage rating, capacitance, and number of terminals. You might have to get creative with the mounting solution if the new cap is different than the old one in terms of shape or size.
Also, pro-tip: when you replace a the cap in the outside unit, install it upside-down so that water doesn't pool on top of the cap and rust it out from the top.
I have a gas furnace and I also keep a spare ignitor handy. It's not a matter of "if" those go bad, it's "when."
You don't need the same model number as the original cap, it just has to have the same voltage rating, capacitance, and number of terminals. You might have to get creative with the mounting solution if the new cap is different than the old one in terms of shape or size.
Also, pro-tip: when you replace a the cap in the outside unit, install it upside-down so that water doesn't pool on top of the cap and rust it out from the top.
I have a gas furnace and I also keep a spare ignitor handy. It's not a matter of "if" those go bad, it's "when."