Answers to your questions:
Before I get into a bunch of answers to your picture and questions, I'll mention that your machine has seen some repair work in its lifetime. The pump is not original (they were black in the 1972 period) and yours looks recent, which is good. Also, you have a replacement lint filter, so the troublesome dome shaped one is already gone. That is also good. Obviously the work done to remove the dispenser is evident too, but A VERY GOOD THING is that all the hardware you need seems to be there to get the dispenser working again.
Onto your picture with the questions:
1) The curtain as you call it is to protect the underside components from leaks or splashing. In later years this shower curtain sort of thing was mounted on the motor to protect it specifically.
2) The "spin cycle pulley" is just that, the basket drive pulley.
3) That is definitely not a hook, its the tip of the spin cam bar which raises and lowers the clutch pads for spin.
4) That big hose is the water supply hose to the dispenser for detergent and softener flushing.
5) That is indeed the valve that turns on and off the water supply to the dispenser. Replacements for these are quite expensive and NLA so its good you have yours.
6) That is a trap - its name at Whirlpool is a Manifold Trap, but other common names are "Pin Trap", "Button Trap", "Pump protector" etc.
7) What you have labeled as a wash cycle pulley is indeed that, but much, much more as well. This is the gearcase drive pulley, which not only allows agitation, but it is reponsible for activation for drain and spin, via the wig-wag/Control magnet. The gearcase runs in agitation the whole time the machine is running, but when agitation is not required, the wig-wag keeps the agitator drive gear disengaged.
8) The lint filter has been replaced, and it too looks fairly recent, but a view above it would help to see if it is clean or dusty.
9) Your question about the solenoids makes sense, because the other two solenoids you can't find are located in the triple dispenser which is missing. One opens the bleach reservoir, and the other directs water from the wash/detergent chamber to the softener section during rinse, to flush the rinse side.
Getting one of these dispensers would be fun to return the machine to proper function, but may be pricey. I can't believe that someone plumbed the dispenser supply hose to bleach supply hose, that's somewhat brainy but a cheesy way to neuter a good machine, lol.
Still looks like a very nice machine, the mechanicals underneath look good.
Gordon
