I saw this doort past me today with maybe even an @HumberSS or look a-like. (Don't tell the Mrs if I'm wrong!) in the co-pilot seat. Sounded/looked awesome.
620s must be amongst the most water soluble vehicles ever made, my Dad owned one before I was born, was on its third set of guards (now in fibreglass) by 1984 when replaced with a new ( and heavily rust proofed) 720. I admire your perseverance.