Hi Kelsey,
The Perimeter Technologies brand is not compatible with any of the Guardian/PetSafe products. If you are looking for collars I would recommend:
PUL-275 PetSafe Deluxe Ultralight Collar
or PRF-275 PetSafe Stubborn Dog Collar
If you need a Transmitter box you could use either:
RF-1010 PetSafe Replacement Transmitter
or SDF-T SportDog Transmitter