I have a few rena xp3's and all of them came with plenty of pieces to make a long intake. I would check the parts you got against the parts list on the manual.
API Rena Filstar XP Replacement Parts Filstar XP ..
Set up> Fluval has the edge in setup. The Rena is ultimately more flexible, but at the cost of setup complexity. There are about 20 pieces in the intake/exhaust system alone. The intake tube consists of a u-tube (and incorporates the standpipe for priming), which connects to the variable-length siphon tube (four-five individual pieces), and then to the screen. Exhaust is comprised of a u-tube, and an assortment of elbows, extensions, outlets (spraybar or jet), flow control, etc. All the parts have tapered ends to allow a friction fit except a very few that snap together. All parts are opaque. Exhaust is black. Intake is a bluish charcoal. I prefer black or transparent. Fluval parts are translucent charcoal (1pc. siphon tube) and medium gray (hoses, exhaust jet, couplers). The Fluval comes with a weird convoluted hose and special tank-side couplers that I don't particularly like, but they DO work well. I just prefer things to stay "standard", so repair parts and modifications are easier (like adding an in-line heater or sterilizer). The Xp3 comes with a set 4'-5' thick walled vinyl tubing. It's kind of a frosty translucent blue. Nice tubing. The fitting on the Rena pump and accessories are all barbs. The system includes locking plastic hose clamps. Have a towel or pair of pliers handy when you install them, they are kinda sharp and hard to close tightly (a good thing, ). The Fluval uses the aforementioned special coupler on the tank-side accessories and uses plastic threaded compression fittings. In both filters' cases, leak tight operation is simple to achieve. Both units use captivated o-ring seals on the pump/case interface, so there is no worry about twisted or pinched seals.
Rena Rubber Foot for xP Filters - Big Al's Pets
API Filstar XP Canister Filters - Big Al's Pets