They're on the left-hand side of the transmission. A 17mm Allen wrench fits in them, and they're the only two bolts on the car like that.
Left side of transmission
Transaxle gear oil is serviced through a large 'female' hex plug on the left or driver's side of the transaxle by the ring gear cover plate.
at the tail end of the transmission housing near the shifter shaft.
dipstick transmission in vw beetle
Jack up the car and put stands under it then look and see where it is leaking.
Drivers side of the transmission case, between the nose cone and axles. The late style (most common) takes a large Allen drive plug 17mm
Back in 1970 all engine controls were done by mechanical means. The answer is no, there is no PCM on a 1970 VW Beetle.
the glow plug relay can be found in the super rapist tard section of your beetle
A transmission fluid leak means that the plug may need to be replace, or the seal or gasket may need to be replace. As it could be caused by a work seal, or gasket, or a loose plug.
The VW Beetle does not have clutch fluid. There is not any fluid associated with the clutch. The transmission has transmission fluid.
A 1970 VW Beetle will have what is referred to as the IRS transaxle not the earlier swing axle used up until 1968. Any good gear lube made for use in manual transmissions will work, an 85W/140 for example. I have used a Slick 50 manual transmission additive in mine that helps smooth the shifting noticeably.
A Super Beetle with a manual transmission has four forward gears and one reverse. A Super Beetle with an Autostick transmission has three forward and one reverse.