[QCS]

I used a K&N 650 filter. I just cleaned the screens and re-used the O-rings. Hasn't leaked a drop.

Same.

 

[QCS]

Theres 7 o-rings in total, 4 different sizes.

No reason you couldnt just get the filter and re use the rest.
I got the kit, but I might just use the filter.

Agreed. I just got the K&N filter (~$9 US) and the oil. Cleaned and reinstalled the magnets. Pretty cost effective.

 

[QCS]

Silicone O-rings 39.34 x 2.62mm Minimum 10 pcs

18mm ID x 22mm OD x 2mm CS - Price is for 5 pcs

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