'91 Start Enable Relay Location

[awdavis01]

The GM TSB on the intermittent start issue with my '91 Regency Elite states that you must replace the starter enable relay (anti-theft) and do some basic rewiring to fix the problem. I've done my dilligence. The glove box is out, the dash undertray is removed, I've bent myself in positions a 47yo man should not bend, and cussed sufficiently to bring myself to this forum and ask...

Where is the starter enable relay located under the dash of a '91 Olds Regency Elite?

The replacement part is a small 1x1 relay box with a mounting tab w/hole for a bolt, and 4 male electrical connections in the bottom. I'm assuming the existing part I'm searching for is like it, but maybe that's a rash assumption. I know it's not the 'relay' on the top of the starter, so focus on under the dash or on the firewall and do your best to remember if you've seen this device.

Thanks, in advance, for all your help.