Looking for a Chrome Gas Cap for a Vintage Speedster Plus Squeal Shims

You will need to know what style gas tank is in your car.  If it is an original VW tank it probably  uses a 70MM cap.  However, there are reproduction tanks out there that use a special cap.  You can measure the diameter of the neck to help determine which cap will fit.  CIP1.com carries an assortment of gas caps for various style tanks.

I doubt that there are anti-squeal shims in those calipers.   Centering shims, maybe, but no anti-squeal shims.

I've had good luck eliminating brake pad squeal by doing two things.  

First, remove the pads, but note where on the pads the piston and caliper make contact with the back side of the pad.  Slowly, gently push the piston back into the caliper a 1/4" or so with a a big "C" clamp.

Apply some brake anti-squeal gel to the back side of the pad where the piston and caliper make contact with the pads.  Be neat - Don't get it all over everything, just where the caliper/piston touch the pad backside.  This is really good stuff:

https://shop.advanceautoparts....BwE&gclsrc=aw.ds

Put it all back together, then step on the brake pedal a few times to bring the piston back in contact with the pad and let it sit for an hour or two (or overnight) to let the gel cure, then you can drive it.

Pads can also make noise if it is really dry in your location and the pads dry out, but that gel should fix it.

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@Verbieten , just curious, is it normal high-pitched brake squeal or a lower-pitched, loud 'moaning' sound?

Also, do you have rear disc brakes, too?

I've used hi-temp RTV sparingly on CLEAN calipers, pads, and the piston. It also works.

Make sure the sliders are clean and lightly greased.

Brake squealing is caused by vibration, so make sure the rotors are true.