They may be ASP, but who knows. That alt pulley seems way to big- the stock is 2 3/8 not 1 7/8. If that is what you have now, then someone swapped on an overdrive alt pulley. Running an underdrive alt pulley like the one you bought will cause all sorts of charging issues. Is your car a stick or auto? Go to the ASP or March site and they have a chart that shows you what size alt puley to use depending on your application and rpm range. You will also need to buy 4 allen head bolts and lock washers for the crank bolt if they didn't come with the pulley, as the stock ones won't work.
For the belt, your best option is to use a piece of string and measure it that way. Then go to parts store and buy 3 belts- one that size and one 1/2" over and under . Test fit for the proper length and within the tensioner range and return the other 2.
That being said, I would not advise using U/D pulleys unless you have a 130 amp alternator.