The early fuses VW used are known as GBC. A unique feature of this design is that the mounting allows for easy cleaning of any light oxidation or contamination of the contacts. Simply rotate them in place the contact patch will clean the contact tip and restore connection. Amongst the downsides of this design, the contact surface is small, especially for larger sizes like 25 A (Blue) used for some radiator fans. Also, when the open the resulting spark is not contained. Also over time heat will damage the plastic core and cause it to fail.

GBC fuses are available in glass capsules similar to AGM.  Here is a picture.

https://www.bing.com/images/search?view=detailV2&ccid=1hFc1hfR&id=D97988047A8F90A6B141623AA7E09549AE708ACB&thid=OIP.1hFc1hfRn5uES-fn0z_JFQAAAA&mediaurl=https%3a%2f%2fi.ebayimg.com%2fimages%2fg%2fCDgAAOSw0e9UtHKO%2fs-l400.jpg&cdnurl=https%3a%2f%2fth.bing.com%2fth%2fid%2fR.d6115cd617d19f9b844be7e7d33fc915%3frik%3dy4pwrkmV4Kc6Yg%26pid%3dImgRaw%26r%3d0&exph=247&expw=400&q=buss+gbc+8+fuse&simid=607992581666315727&FORM=IRPRST&ck=8660C0AB86611395F861992BCB742424&selectedIndex=115&ajaxhist=0&ajaxserp=0

The glass style fuses are an effective, low cost drop in upgrade. They avoid damage from handling and when the fail, the spark and hot dropping is contained. The tin plating on the contacts also reduce the corrosion there.  They are also available in more sizes and simply more reliable over time. They are a bit more difficult to find. I see lots on e-Bay.

Dennis