This reservoir is originally used on T25 bus without servo, but is also perfect to suit buggies or any other conversions where you want to eliminate the brake fluid lines between the brake fluid reservoir and your master cylinder. It mounts right on top of your brake master cylinder, so eliminates the brake lines… Will fit all beetle brake master cylinders with dual circuit 1966 and later, but will be not very practical in a real beetle, because it makes it so much harder to check your brake fluid level.