Cam chain specs for 1998 WR400?

Time to do the top end on my WR400 and since we can get D.I.D cam chains at work I was wondering if anyone knows the size/type? I think it is 120 links but not sure if it is a 3x4 plate or a 4x5 plate. Any help would be great :)

 

I can pick between the following chains:

http://www.bigbikeshop.hu/katalogus/did_2012_katalogus_v4_web.pdf

I looked it up in the pro-x catalog and for the YZ/WR400/426 the pro-x part #31.2419 crosses over to 92RH2010 -120M Borg Warner

Both Yamaha and Pro-X chains are sourced from Borg-Warner Japan, and as far as I can determine, there's no difference between the two. 

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