You have a pretty good machine with your Legacy and its attachments.
Most of the front end loaders weren't that hard to remove and park them so you could put the other attachments on it that you want.
The Gravely snowblowers were actually better and built a lot more rugged than the Simplicity units. The Gravely used a driveshaft to drive it, the Simplicity used a belt drive on their snowblower.
Those older Gravely's are tough machines built to outlast most other manufacturers machines. Good to know you are a 'Old School Gravely' person, you know a good tractor.
Your Legacy was built from 2004 to 2015 with the Briggs 27hp diesel. 2015 was the last year they made the diesel powered Legacy.
The best way to tell the year of your tractor would be to get the engine model,type and code numbers to get the build date of it and figure that is the year the tractor was built as long as it is the original engine, it will get you very close to the manufacture year of it.
The best gas powered Legacy was the Kawasaki engine back then, a lot better motor than the Kohlers of that time, plus being liquid cooled you could put a hot water cab heater on the tractor, same with the liquid cooled diesel engine units which worked out well for winter use with a cab installed.
One of the problems we had with the Legacy snowblower was it didn't raise up that high for transport so we made some adjustments to the lift linkage so it would go up higher.
They did use a belt from the engine mounted PTO clutch used for front mounted accessories to the stub shaft on the front axle on some of them, then to a driveshaft to the blower assembly instead of the long driveshaft from the transmission used on the mower deck like the Gravely did. Some think of it was because they had a driveshaft already leading up to the front for the 4 wheel drive units and they wouldn't have enough room for it.
The diesel was the longer lasting engine that usually started easier in cold weather than the gas engine did in the older models before they came out with the fuel injected gas motors, which can be trouble prone and expensive to fix.
You would like the Legacy if you do get it, it was a well built machine.