A combination of: - an extraction unit for extracting cartridges (1a;1b) of two different dimensions (da,ha;db,hb) comprising: - a seat (14,20) for receiving any of said cartridges (1a;1b) for extraction thereof in the seat, the seat being in particular delimited by a first part (20,30,33) and second part (12,13,14) that are relatively movable between a cartridge extraction position and a cartridge loading and/or ejection position; and - a pair of slides for guiding any of said cartridges (1a;1b) towards said seat (14,20) in a sliding contact of each of said slides with a cartridge guide (5a;5b) of said cartridges (1a;1b); and - said cartridge (1a;1b) having said cartridge guide (5a;5b) and a dimension selected from at least two different dimensions (da,ha;db,hb) of cartridges (1a;1b) receivable in said seat arranged so that the cartridge are guided by the slides towards the seat in a sliding contact of each of the slides with the cartridge guide of the cartridges, characterised that the slides are relatively movable to be spaced apart selectively by: - a first distance (Da) for guiding towards said seat (14,20) a first cartridge of said cartridges (1a;1b) having a cartridge guide of such a first size (da) as to be in sliding contact with both slides when spaced by said first distance (Da); and - a second distance (Db) for guiding towards said seat (14,20) a second cartridge of said cartridges (1a;1b) having a cartridge guide of such a second size (db) as to be in sliding contact with both slides when spaced by said second distance (Db), said first distance (Da) and said first size (da) being different, respectively, to said second distance (Db) and said second size (db). - an extraction unit for extracting cartridges (1a;1b) of two different dimensions (da,ha;db,hb) comprising: - a seat (14,20) for receiving any of said cartridges (1a;1b) for extraction thereof in the seat, the seat being in particular delimited by a first part (20,30,33) and second part (12,13,14) that are relatively movable between a cartridge extraction position and a cartridge loading and/or ejection position; and - a pair of slides for guiding any of said cartridges (1a;1b) towards said seat (14,20) in a sliding contact of each of said slides with a cartridge guide (5a;5b) of said cartridges (1a;1b); - a seat (14,20) for receiving any of said cartridges (1a;1b) for extraction thereof in the seat, the seat being in particular delimited by a first part (20,30,33) and second part (12,13,14) that are relatively movable between a cartridge extraction position and a cartridge loading and/or ejection position; and - a pair of slides for guiding any of said cartridges (1a;1b) towards said seat (14,20) in a sliding contact of each of said slides with a cartridge guide (5a;5b) of said cartridges (1a;1b); - said cartridge (1a;1b) having said cartridge guide (5a;5b) and a dimension selected from at least two different dimensions (da,ha;db,hb) of cartridges (1a;1b) receivable in said seat arranged so that the cartridge are guided by the slides towards the seat in a sliding contact of each of the slides with the cartridge guide of the cartridges, - a first distance (Da) for guiding towards said seat (14,20) a first cartridge of said cartridges (1a;1b) having a cartridge guide of such a first size (da) as to be in sliding contact with both slides when spaced by said first distance (Da); and - a second distance (Db) for guiding towards said seat (14,20) a second cartridge of said cartridges (1a;1b) having a cartridge guide of such a second size (db) as to be in sliding contact with both slides when spaced by said second distance (Db),