I have the 80, it's like a 30lbs seat! I used Rennline's seat belt anchors (for racing harnesses) to create my own latch system.
http://us.diono.com/en/customer-serv...car-seat-range

 

I think the Diono Radian rxt will work. It seems to be sold as narrow base where they show 3 in a row. I will order one this week and see.

 

The Recaro Probooster ($103 form Amazon) fits perfectly and has full side impact protection. Looked for a long time, and this seems to be the only one that fits. Good quality, no mods needed, and still room for my wife in front passenger seat.

 

Mike, is this the Rennline you used?



Or this?



Or something else?

 

I got 2 of the bottom one. But had to grind it down a little bit to get the latch hooks to grab. Just unbolt the seat belt bolts, hook them in, & screw back down. Was easy. But both on one seat, on e on each side.

 

Ive tried almost every seat. Try the full back Combi Kobuck.

The others don't work well at all...

GL

 

I did the Rennline LATCH upgrade also. I didn't grind down the anchor points, I just use a needle nose pliers and pop the retaining hook. The only problem I have had with my "LATCH" system is how short everything has to be to work. I have to put beach towels under and behind the child seats to get the belts tight enough. If I could (hypothetically) swap out the belts so they could be shorter I would. I also did the upgrade to add the center anchor point.

My boys love riding in the Porsche, and I love sharing it with them. Makes all the work getting them safely into the car well worthwhile.
--Joe

 

Do you have pictures?

 

Sorry, can you elaborate on this? I thought most people were using a Ford part for a tether mount. Are you using BK parts instead?

 

What about baby seats for a coupe?

 

Me too, but I retrofitted with the old LATCH (just hooks, not the rectangular ones with the nested clamps, and I didn't have to grind that way.
Me too.

 

Search on me and baby seat or child seat. Cab is slightly narrower, but about the same story.