Well here is the trigger. Sheridan Blue Streak Trigger, NOS, excellet shape - Trigger Groups - KP / Sheridan Rifle Parts - Sheridan - Pump - Parts
The back block can be harder to find.
There are other options for putting it in a stock.
You can use one of these; http://www.mcarterbrown.com/forums/s...ger-group.html
If you do a search for kpmi, you will find many that use that trigger group. That trigger pack is still available from Crosman, and so is the stock that matches up to it.