Hi MarkN, and a big warm welcome to the forum.
If you have any traces of the original paint, as you have suggested, under the hand grips etc, if you take the parts to any good paint store, they have the technology to computer match the original colours for you.
The original paint formula would be very hard to come by now, as early Qualcast push mower information is very thin on the ground.
MarkN. once again,
