JasonAndreas

elbeee964

Heh. I'd thought that borehole was a removal-assister (for drilling out stripped socket heads.)
Guess it works both ways -- just better at one.

Metal Guru

I used 12.9 grade button head allen bolts. The low profile allows the seat to glide over.
The stock bolts strip out easily, which is why I made the switch.

964George

I also took the torx option to stop them being rounded off by idiots



Stainless steel low profile torx



These are all the measurements you need, all in mm and taken from an original Porsche seat bolt, oh and the thread pitch is 1.25

2000m2

Good thinking. I have one on each seat that are stripped. Trying to put in new seats. Gonna have to get creative!

964George

I hear ya, a few of mine were stripped and the rest weren’t much better...

Spyerx

Chisel (catch edge and try to knock it in reverse) or a reverse drill bit. It SUCKS to get these out.

I have a couple boxes of grade 12 bolts with proper allen heads I got from McMaster.... those short head bolts suck.

chsu74

Yup. McMaster-Carr SKU# 91290A426 M8 X 1.25mm thread. 20 mm long

Sirenty

Something like these extractors work great for getting stripped or broken screws out. I haven’t used this exact one, but mine is identical.

Amazon

Amazon

540964

Use the correct tool, hex according to DIN 6911 and the bolts are fine.
I don’t recall the hex size (I have a complete set) but this item available on Amazon will give you the right idea.

2000m2

Might be challenging to get a drill in there, but worth a shot and better option than anything else I have.

Thank you! Ordered & ordered.

Peteinjp

Also it should be noted that for the stock seat bolts you must use the washer due to the fact of the threads do not go all the way to the head. If you do not the will shift slightly in use.

540964

Another source
https://www.kctoolco.com/l-keys/?brand=41

2000m2

Thanks for the tips!
I had to drill out one bolt. Most were straightforward, a few I had to get creative (torx head & rubber mallet!). The bolt & washer kit from Classic 9 worked great, just be careful when installing so as not to deform the heads. I’d definitely get a different type of bolt if I were swapping out seats regularly.
Anyway, I got my new seats installed this evening. Funny things one learns in the process, like the drivers seat was on some extension rails that allowed for the seat to be placed further back. A previous owner must have been tall. I’m about 5’11”, so standard mounting points are fine and saves me a fraction in seat height. I even got some loose change and someone’s old earring out from under the old seats. I also removed the amplifier under the passenger seat that wasn’t connected.

JohnK964

Got any pictures of these brackets that let the seat go back father might want to buy them if you’d sell