Hello! I bought 58 boneville conv at Mecum in August. The VIN reads P558H7777. The car has no cowl tag. Question - where can I get any info on the car to be sure that it is real convertible and not a conversion and is it possible to order anywhere the cowl tag info and reproduce it? Thank you for any help!

I believe the Pontiac Historical Society is good at that kind of thing. I think you can order repro window stickers and such, as well.

http://www.phs-online.com/

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

They provide only info starting from 1960

http://www.vinwiz.com

http://www.decodethis.com/Default.aspx

Maybe the people at these can help...?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

still no luck!!! they start from 1964 and 1967...

I'm sure a 58 Service Manual would help break it down. I know I have one somewhere but I hav'nt seen it in years. Are you a member of P.O.C.I. (Pontiac Oakland Club International)? They have several group experts for each model that can tell you more than you will ever want to know.
Just a thought.

from http://starchief57.tripod.com/vin.htm

VIN decoding for 1958:

First digit is the assembly plant:
Atlanta, Ga - A Kansas City, Ks - K
South Gate, Ca - C Linden, NJ - L
Framingham, Ma - F Pontiac, MI - P
Arlington, Tx - T Wilmington, De - W

Second digit identifies the series:
5 = series 25, Bonneville/Chieftain conv.
7 = series 27, Chieftain/Star Chief station wagon
8 = series 28, Star Chief, Super Chief

Third and forth digit identify the model year (1958)

Fifth digit identifies the transmission type:

H = hydra-matic S = syncro-mesh

Last four digits represent the basic production number

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Dale

I decoded it the same way, but there are trhree possibilities for this car:
Bonnevile hard top
Bonneville conv
Chieftain conv

How to prove that the car I have is true bonneville?