Ok,, this is from memory, so bear with me...
I found it IMPOSSIBLE to simply compress the shock. I took a ratchet strap and looped it around it to shrink it about 1-inch. I remember disconnecting something that left the seat connected but allowed it to open a bit more than normal. I was then able to slip it in and bolt it up. I lowered the seat to let the strap loosen up. Took the strap off, lowered the seat a bit more to line up what i took off that allowed it to open more.