The quickhitch for Grand L30's and L40's is the same (L2180-1) and there are a number of snowblower models that fit the "duckbill" of the quickhitch. The quickhitch is adjustable in length and height to accommodate all models listed above. The most you'll possible need to work on your specific tractor is a new driveshaft from mid PTO to QH. These are still available from Kubota as of last year.
It may even be possible to use the quick hitch from the newer Grand L60's, but they changed to a 4-bar connection for the blower and this setup is very expensive and positions the blower further forward of the tractor. The newer QH, L4455 or L4554 can fit the Grand L40 series, so I see no reason why they wouldn't fit the Grand L30's as QH L2185 fits both L30 and L40's. You'd want to do your homework if going this route to confirm it will work.
For the record I've adjusted my quickhitch two times now. Bought used and needed to be shortened and lowered the duckbill to fit the
L3130 as it was originally setup for a much larger
L5030. After purchasing the
L4740 it was adjusted again to fit.
QH: Don't worry about it being a L2180 or L2180-1 model. Both will work. My QH was the older model and I converted it to the -1 (updated model) by a kit that is still available from Kubota (At least it was last year). The upgrade kit added another attachment point to the middle of the tractor. Not certain this is really needed and wouldn't spend the money for the kit again had I known what all was included before hand.
It shouldn't be too hard finding a blower/QH, but you may have to travel to get it or have it trucked across US as I did.
Enjoy the new tractor.