Cusco RS LSD S13 Install Half-Shaft Help!

[ZoltecRules]

I'm at my wits end here. I ordered a Cusco RS 2-Way for my s13, open diff car. Dealer told me I needed to get some JDM Viscous Half-Shaft also, because he said that the open diff shafts were too long to fit. Got the LSD, bought JDM shafts (from a 91 Silvia) and they don't want to fit, they're too small in diameter. Someone please help me here.

Pics of the JDM VLSD Shaft(left) and open shaft(right):

http://img.photobucket.com/albums/v280/ZoltecRules/Axles002.jpg
http://img.photobucket.com/albums/v280/ZoltecRules/Axles001.jpg

And the pic of the shafts in the housing from the silvia:

http://i6.ebayimg.com/04/i/04/5b/bb/c5_1.JPG
http://i9.ebayimg.com/04/i/04/51/68/bf_1_b.JPG

[ZoltecRules]

Someone help me!

[2JZGTE]

Did you try using your open diff half-shafts? The open diff halfshaft does look a little longer, but worth a shot.

[ZoltecRules]

Tried open diff ones, the spline pattern fits, but the grooves don't match up. Theres a 1/4 gap on the pass. side between the shaft and the side of the housing.