Ok...so here are all the bits inside there.
Not counting the engine case, the order they go in are:
(a) Little o-ring (sitting on the oil filter) goes over the engine oil port hole.
(b) Oil filter with the OPEN HOLE SIDE FACING IN goes on the oil port hole snug to the little o-ring.
(c) Large o-ring (goes on the oil filter cover in the obvious recess).
(d) Spring (keep this on the cover when reinstalling and push the cover and spring on simultaneously).
(e) Oil filter cover.
Pretty simple, but very easy to get that filter in backwards. When putting on the cover, push the spring onto the cover and apply gentle pressure as you make contact with the oil filter, then wiggle it slightly while holding light pressure to make sure that the spring sits into the recess on the outward side of the oil filter.
That's it!