here you go
I know it's the jeep site, but they have the rb1 and installation instructions for the jeep that can be pretty easily adapted for the pt
"For anyone who is upgrading the factory amplifier and speakers, the RB1 will serve as a great system head unit. Using the Chrysler wiring adaptor harness, part # 82207541, the RB1 will plug directly into 1999-2001 vehicle harnesses. Adding a Mopar 10-pin to 8-pin CD changer cable allows the operation of the factory 10-disc CD changer."
RB1 Specifications:
Manufacturer : Alpine (Alpine Website) / made in Japan
Application : Selected Chrysler 2002 and later model vehicles (w/22-pin radio connector)
Type : Flush mount AM/FM/CD Navigation Radio with CD Changer controls, DVD based
Screen size : Full color 4.1" diagonal (3-3/4" x 1-3/4") (95mm x 45mm)
Screen area : 6.62 square inches (16.81 sq. cm.)
Mounting size : 1.5 DIN (3" H x 5.51" D x 7.87" W) (88.5mm H x 140mm D x 200mm W)
Antenna : Flush mount, inside dash
Bus : J1850 bus specification for NAV information
Tuner : AM/FM tuner for US/Canada markets
AM Frequency Range : 530 kHz~1710kHz
FM Frequency Range : 87.7MHz~107.9MHz
Clock : Auto-set via NAV satellite
Satellite Radio format : Sirius
Navigation satellites : Receives GPS signals from up to 8 satellites to display the position and direction of your vehicle
Navigation accuracy : Three satellite signals allow for a navigational accuracy of up to five meters (16.4 feet)
CD Changer operation : Same 10-pin/8-wire connector as 2002 and later factory radios. Controls any Chrysler external CD changer
CD Audio : Plays CD, CD-R and CD-RW. Not compatible with MP3
Power : 66 watts total power at 3% total harmonic distortion
Weight : 5 lbs, 7 oz.
Shipping weight : 10 lbs. (in original factory carton)
Mopar RB1 package contents : Rb1 radio, NAV antenna, instruction manual, mercury warning sticker, DVD disc, coupon for free update disc, foam strips, basic installation diagram. P/N 82206406
Retail price, USA (MSRP): $1595.00 (not including installation)
hope this helps