Looking for data on 1980s CDS cells - VACTEK VT212/VT212L

I'm trying to find a modern CDS cells to replace these old timers (1982) from the 70s, I did find a catalogue page for these CDS cells, but the details are not as useful to me as perhaps they would be to someone handy with using CDS cells.
The ratings are:
VT212L - 6 R1, 5 R2
VT212  - 7.8 R1, 5 R2
R1 defined as 2fc resistance in K Ohms (tolerance +/- 33.3% @ 2850K Source
R2 defined as min dark resistance (Megohms) in 5 sec.
Having a heck of a time matching these to more modern cds such as carried by DK or Mouser. I tried the NSL-06S53, but its light resistance is too sensitive and nothing else on DK was better.
Anyone have a VACTEK catalogue who could scan the pages that might help?
I suspect that PerkinElmer bought out Vactek as they used similar part (VT200x) numbers as early as 2001 that I could find on web.archive.org, but that archive doesn't have the parts books captured.
Bitsavers doesn't list it, nothing on ebay either...
Why am I bothering? I have a rifle gallery (http://www.bonanzagallery.com/) that uses flash tubes in the rifles to trip the cds cells in the targets and there are around 70 cds cells. A number of them are failing so I want to replace them with something that will work reliably.
Thanks as always for your time!
John :-#)#
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