Sorry - this is so late - I was very busy in August and didn't catch this one!
I hope you got what you needed - it is practically impossible to find antique car and vintage guitar digi stuff - I know - my husband restores old model a fords as a hobby.
I have the antique car idea down on my list to do - as a new designer - I have tons of real images and parts to work with - ha ha.
And I personally own a vintage guitar - well to me it's not - but to others it probably is - since I bought it in 1977 to replace a guitar of mine. So I hope to have something along these lines - but unfortunately - too late for your invitations.
I hope you found something.
We do not stop playing because we grow old...We grow old because we stop playing.