I'd highly recommend finding a workaround for the compactron tube and the vactrol LDR.
I don't think anyone has a stockpile of compactrons that they trickle out to keep the price high. They are just real rare now. You can buy new (NOS) ones for $100 or bid against folks trying to keep their vintage amps stock. Not worth it.
Use 2 twin triodes and leave half of one unused.
If you are set on using the vactrol LDR, there are ones available from Xvive, but not sure which of the VTL5C series you need. You would have to look at the number on the one in the amp you have access to, unless someone knows which VTL was Fender 013556. I couldn't come up with anything from a search.
The reverb tank should be 8AB3C1B.