Thanks for the plug Glen!
Yes Duane, I have a NOS original thermostat knob.  
Regarding the vin # tag on the left side, if it's this little brass tag that is oval a couple inches in length and says something like G2375, it is usually found more often on 35's, not 55's.
The 55 vin # tag I'm thinking of is about the size of a credit card and is usually located on the right side below the loading door. See pic attached.
Give me a couple days, and I'll shoot you some pics of what I have.  Thanks.
Thanks for the fast reply.  It is the smaller brass tag I believe.  The spacing between holes is 1 5/8" apart (disregard my earlier measurement) and there are only two holes in the body.  Definitely not the credit card sized one.  I look forward to hearing from you.