Your search for "pe-4ds3" revealed the following:
NEW Juniper PE-4DS3 M Series 4-Port DS3 PIC Expansion Module
SKU: NSN-3272
Condition: New
Shipping: Overnight Options
Warranty: 365 days
NEW Juniper PE-4DS3-ATM2 M Series 4-Port DS3 ATM2 IQ PIC Module
SKU: NSN-7805
Condition: New
Shipping: Overnight Options
Warranty: 365 days