[kach22i]

Roll Bar 911® / 930 - Aluminum - Coupe - Sunroof - Bolt-in - X Diagonal and Tunnel
Part #: HEI 911 001 006A
https://www.fvd.net/us-en/HEI911001006A/roll-bar-911-930-aluminum-coupe-sunroof-bolt-in-x-diagonal-and-tunnel-support.html

Facts:
Bolt-in Bar
Aluminum 1.5-inch diameter tubing, .098 wall thickness tubing.
Bars which connect to the main hoop, use a connecting joint system.
Aluminum Finish.
Primarily for street use as a harness bar is not an option...................

Heigo Motorsports has been building extremely safe Roll Cages and Roll Bars for the Porsche® vehicles for 30+ years. They have also produced countless factory and motorsports bars and cages for the marque over the years. We purchase their bars because they have a long-standing history with the FIA and DMSB in Germany. They have hundreds of approval certificates to their name and maintain a meticulous safety record.

More here, all the aluminum ones even the welded-in ones say no harness bar from what I can tell.
https://www.fvd.net/us-en/shop?&term=roll+bar&searchtype=fvd-product&search_mode=&view=thumb&order=score&fq%5B%5D=735