wscst question on page size vs drawer

Trying to get a wscst setup for an hp4100n to access both
letter & legal trays. Sometimes sending what should be 8x11,
one form is legal 8x14(in as400 it is 112 lines at 8lpi and 96 columns at 
12 cpi (special preprinted form).
The letter stuff prints fine. The legal does not, because (according to
a HP tech, the printer is receiving a request for Tray 2, but for 
page size=letter. This confuses it, and tries to pull paper from Tray 1.
I see in wscst things like 
:PAGSIZE
PAGWTH=12240 
PAGLEN=15840 
 DATA ='1B266C303241'X. 

Question - HOW DO I tell what pagwth & paglen my report is? or is 
there a way to force "legal". Cannot see anything in OVRPRTF. 
Looked in WSCST manual but cannot tell.          
Have set up 2 wscst, one for letter, one for legal, and 2 remote queues.
even if i change every size in the "legal" wscst to legal 1B266C3341,
how do i know if my form is one of those sizes?
jim

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