Ht-220
Then how do you tell what frequency the crystals are for? I tried to look for some sort of part number on the crystals, but couldn't find any (Except for KXN, but nothing following it).
I found the radio model number on the eBay listing: H34FFN3170E-SP5. It's NYPD surplus.
I was wrong about the model numbers. The first number is the power of the transmitter, the second is the frequency band, yours is a UHF unit. In your case the unit is a handheld or portable radio (the H). Power out is, I think, 5 watts. I don't remember what the three letters FFN stand for but it has PL and it's a special build.
In order to figure out the carrier frequency of the receive crystal you will need to know the 1st IF frequency. Then you will need to know what multiplication is applied to the fundamental crystal frequency. Figuring out the transmit frequency is a little easier. You need to know the multiplication and then multiply the crystal's fundamental frequency times the multiplication.
As I said, the number stamped on the crystal is its fundamental frequency in Khz. So if you have a crystal that is stamped 14253.125 and the radios operating frequency is 456.1 Mhz, then the radio multiplies the crystal frequency by 32. 14.253125 Mhz X 32 = 456.1 Mhz.
As others have said, this radio will be unusable in commercial land mobile service shortly. So, unless you are going to do a band change on it for ham use, don't waste your time and money. Parts are not available for it from Motorola anymore. You might be able to find crystals to put in in the ham band but I wouldn't know where to tell you to look for a band change kit.