Be careful about using the seperator plate from the other vb. If the other vb was as old as you said they may not be compatible. Do you have the atsg update manual?
If not email or pm me and I will send you the info...but basically the newer one prob has the reverse engagement valve, and down by the low reverse servo, looking at the plate with low/reverse servo hole at bottom right, on bottom left area there should be three small holes in a line....but if the old one did not have rev engagement valve, it has a slot down the in lower left corner area... it's kinda hard to describe but if low/reverse servo is at bottom right, at bottom left there are three slots in a row, next to a hole that's the shape kinda like a spout on a sink faucet, or the handle you use to flush a toilet;-) Well to the left of that hole theres either 1 slot, or three holes that go from smaller to larger, I think both plates must match there... either slot or holes, or you might mismatch plate and vb...
Good Luck!
Respects,
Ragga