You're contending that the Pep Boys product looks identical to a Lexus DEG that is 4mm's wide, custom tooled to the door contours and exact paint color-matched, and it clamps around the backside edge of the door onto the 2.5mm quiet space (before the door sealant ridge)?? Really??? And it retains on the door without glue for five years?? Wow; sounds like Pep Boys has advanced the art of plastic extrusion molding technology to an unprecedented level.
Apparently the folks at Pep Boys have back-slid in the intervening years because the store I frequent in Southern California doesn't stock any exact body color matched plastic door edge channel extrusions. In fact they only have black, white, clear, or mirror-silver extruded plastic with adhesive in the channel, and they also don't carry a slim channel that looks exactly like the Lexus product. The Pep Boys channel is 12mm's wide compared with 4mm's for the Lexus. The Lexus stainless steel DEG has a wall thickness of .05mm's versus 3.5mm's for the Pep Boys plastic extrusion. Sorry to say, but Pep Boys sell rubber galoshes for your doors.
Fact of the matter is that the Pep Boys plastic extrusion channels are physically too large to fit door gaps on four door Lexus cars. Measure the quiet space gap from the rear end of the front door body side molding to the edge of the door. It's less than 5mm's of clearance space that the 12mm wide plastic extrusion channel can't fit into. That's a problem.
Second problem is that you can't open the rear door without the body side molding impinging on the chubby Pep Boys plastic extrusion channel on the front door. How did I figure this out you might ask? As I began my journey to fix the buggered up edge my boss was so kind to install on my front door, I started at Pep Boys and bought the plastic extrusion channel you refer to (it was $16 by the way).
First problem I encountered was interference with the body side molding. I took my Exacto knife and carefully whittled back the width of the plastic channel to fit the 5mm available quiet space around the body side molding. I got it to fit and was very pleased with my handiwork until my friend tried to open the back door and the edge of the body side molding on the back door got hung up on the front door extrusion channel.
It took me a while to understand that the doors open in an arc as the door swings because the hinge point sits a couple of inches in from the plane of the door skin. Due to the door swing geometry, the gap between front and rear doors doesn't remain consistent. The gap narrows as the rear door swings, (hence the cause for the interference issue with the body side molding). This wouldn't be a problem on your two door Boxster, but it is an issue for a four door car.
When I figured this out, I understood why the Lexus Door Edge Guard was made of stainless steel 4mm's wide with a wall thickness of 0.5mm's. I bought the OE parts and they fit perfectly, don't interfere with the body side moldings and you can barely see them on the doors because they are an exact paint match. You simply can't buy a comparable aftermarket part that looks and fits like the OE Toyota/Lexus solution. I wasted a lot of time !Removed! around with the Pep Boys stuff that wound up in a dumpster.