I solve the same problem by adding under the rear bumper, both sides, this
LED lights wired to the backup bulb circuit in the tail light housing

https://www.amazon.com/YITAMOTOR-Single-Driving-Waterproof-Warranty/dp/B01A6TNWHW/ref=pd_yo_rr_rp_2/146-8804235-4462417?_encoding=UTF8&pd_rd_i=B01A6TNWHW&pd_rd_r=620dd953-73d9-48a5-979c-6492772f0ac1&pd_rd_w=rGMAv&pd_rd_wg=LftSQ&pf_rd_p=f8972fbb-cc4f-4ff5-ae6a-e57ef23cc324&pf_rd_r=SXVYJB61XSNY755S0V9A&psc=1&refRID=SXVYJB61XSNY755S0V9A

like this https://www.thesamba.com/vw/forum/album_page.php?pic_id=1547196

unless you want to keep your strictly stock appearance then don't do it...
:-)

On Thu, May 28, 2020 at 3:29 PM Michael A. Radtke <wa7zpu@5by9.net> wrote:

> Hello,
>
> 1984 TinTop
>
> Since new, I have been disappointed in the backup lights.  I searched
> the archives for advice, but didn't find anything useful.
>
> My light assemblies do not have reflectors for the backup lights, so it
> seems the best LED replacements would only shine out the end of the
> bulb.  Has anyone any advice?
>
> Thanks,
> Mike
>