Just to be sure to be sure that I truly understand what you're talking about ^^ does your 2-post lift have 4 arms, 2 on each post/side that swing on a post mounted (& raised/lowered) bracket, so that you can put a lift point under the front & rear of each side of a car?? :dontknow:
If your hoist has got 4 arms, 2 on each post, then lifting a Spyder, which only has 1 rear wheel & not a heap of solid lift points down the rear end, especially not if you need to lift equally/evenly on each side of the Spyder & need to leave the rear wheel hanging (remember, it's much harder to get the wheel off if it's not hanging!
), then it may be juuust a little problematic, possibly not necessarily insurmountably so, but still... 
In an attempt to keep it brief, let's just say that I truly could not stifle the "WT 'expletive deleted' were you dreaming of by trying to lift it like that?!" moment when I saw the result of a Spyder falling arse-end first off raised a 2-post/4-arm lift, then flipping completely upside down with all 3 wheels in the air, bending the frame & swingarms, smashing the windscreen & pretty much all the tupperware in the process, and cracking a number of fairly important mounts & castings on the engine/trans casing as well! :yikes:
At least his insurance company did (eventually... :sour: ) pay him out the same $$ he'd paid for the Spyder just a couple of weeks prior, but he had to argue with them about that!! Funnily enough, he doesn't ride any more, and he's sold his 2-post lift too! nojoke
So if you do head down this path, just make sure that everything you use is solid; and that your Spyder is lifted AND HELD in a balanced and stable manner, even if you do substantially change the CoG &/or balance point by doing something like removing a wheel or two while it's up there! :lecturef_smilie:
