Talking BRP accessories:
STORAGE is a yes! You need a place for some of the below stuff, sunscreen and small cooler!...
If stored outside a COVER is a MUST! I garage mine in heated, very dry garage so not for me. BE sure it's really fits SNUG especially if trailering with it on! An extra tarp on while stored over the cover is nice too.
FLUSH KIT a must, no water seems real clean anymore, I flush the exhaust every trip. The "expanding as seen on tv" HOSE makes it easy without a quick disconnect even!
...and if you are gonna be off the Spark in the water a lot (And getting tired) the rear STEP is helpful..
I have the SIDE PROTECTORS, they already paid for themselves against the dock in rough water
diddo the orange SIDE BUMBERS, thick! just one good tap and you'll be glad!
Nice to have: WATER WHISTLES, SPARE KEY /LANYARD, and MANUAL REVERSE (mine is backordered too, I have the 60HP so no IBR) and a LONG MOORING LINE. BRP has em all!
(My dealer gives me 10% off AND 10% as "cash" on a loyalty card for future stuff. So the price is ok. No markup over BRP MSRP either.)
Not worth the $$: the ACCESSORY NON-SLIP MATS, go aftermarket or not really needed. Wish I'd saved the $$.
Can't see the BILGE PUMP being needed, even with broken LH accessory cover and choppy river waves my bilge is dry ('cept for a couple coolant drops from the overfill on first run).
NON BRP stuff: Of course items that you can get elsewhere, HOSE PINCHER(S), TOW STRAP, mini waterproof FLASHLITE, SOS flag, all good to have aboard. I'm not concerned with removing the seat while gasping for a fire extinguisher. Already it is a burning watercraft with gas and fumes. SWIM away! I rather store a thermos under the seat!
With a trailer think: trailer AND hitch LOCK, SPARE/WHEEL tire and always 2 (not one) TIEDOWNS. I also added a 6 ft heavy duty w/ 2 loops CABLE and a PADLOCK to lock the Spark to the trailer. (Two guys could lift it off fast and toss in their truck. So if you stop for a restroom or even a fast bite, better chance it's still there!)
Add a battery TENDER, as low as $6 at Harbor Freight as an example. Rotate mine every week from Jeep to my Spark to keep voltage at the proper levels.
Sunglasses HEAD strap keeps 'em off the bottom of river/lake/ocean. 2mm shortie WETSUIT is perfect in spring/fall in northern climates/cold ocean. WATER SHOES are almost a must. Spend extra on a fast drying/comfortable PFD. Makes the trip more pleasant. Have a accurate tire pressure GUAGE. SET your trailer tires to the COLD sidewall pressure listed every other week at least when they are cold/not driven . (4.80x12's typically are 60 lbs at 68'F). Does your JACK work on the trailer? Try it.Maybe in the dark for practice. With that spare wheel tire/rotate it on the trailer every season. I rather be on the water and spend an hour with some of these itmes than on the side of the road!
Saw first Spark other than me on the mighty Columbia River outside Portland, OR/Vancouver WA yesterday! Nice ride!