posted this a LONG LONG TIME AGO -
attached pics of custom made tow brackets I got about 15 yrs ago - they work fine
- I added some extra reinforcing to prevent bending side-to-side on tight turns - (or in case you back up & jacknife) - hence the welds you see -
use a late VW Bug towbar - they are cheap and easily available - and add a reinforcing strap on it too, to make a double "yoke" per picture - same reason as above
fwiw - I use this same VW towbar for my 914, my MGB and my Manx -
I maybe have the schematics for these in my files - all you backyard engineers should be able to easily make a set
you
MUST put at least one long bolt all the way thru the body to the trunk interior - on each side (I used 2 long bolts on each side)
- the threaded body inserts on both 914's and 911's are not really very strong to begin with, and years of hidden rust and PO's cross-threading 'em can make them very weak - this is a classic failure point on old 911's
(caution - a friend bolted a set like this to the front control arm points on a rusty 914 and ripped out the bolts when he hit a double-hump on the freeway - yanked the bar right off the car on one side
here is a link showing the towbar -
VW TOWBAR.
Click to view attachment Click to view attachmentClick to view attachment.