I also used black RTV at each end and in the middle of the rubber seal to reattach the seal to the cowl. By attaching the seal in this manor it is possible to remove the seal at a later date (as I found out recently during a BOMBing project) although, the seal WILL remain in place until you WANT TO remove it.
As for the L-shaped foam end seals, I'm currently on my third pair (they keep squishing out of their designated locations after driving). The last set I installed (just recently), I removed the double back tape from the back side (by carefully heating the tape with a heat gun and gently removing same), using Loctite Stik'N Seal waterproof adhesive to reinstall the seals. Careful cleaning of the plastic cowl cover is also the secret to good adhesion. It has been about a month and the seals are still in the EXACT location I installed them. This should be the last time I will have to replace these little buggers.
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'98. 5 2500 QC 4x4, (BLACK) SLT Sport, ISB, LWB, 3. 54 LSD, A/T, Glasstite Vision II canopy, Line-X bed liner, 285/75R16 BFG A/Ts on 16x8 M/T Challengers, Warn 4X Boards, Mopar fender flares, front and rear NW Custom stainless steel/rubber mud flaps, Mag-Hytec diff. cover and trans. pan, Edelbrock IAS shocks, Mopar tow hooks, Reese Titan V hitch, Jordan Research Ultima 2020 trailer brake controller, VDO Vision gauges, '00 Sport grille, '00 Sport headlights with PIAA Super White 9007/9004 bulbs, 4-2-7+4 Brite-Box, PIAA Dual Sport 900 auxiliary lights, BD exhaust brake and TorqLoc, Prime-Loc fuel filter relocation kit, Bosch 275 hp. injectors, VA CPC, DD Boost Module, Banks Stinger wastegate actuator, BLACK '00 valve cover, Banks Stinger 4" dia. stainless steel exhaust system, BD LV V10/Cummins hybrid TC and valve body, BD modified transmission front pump and PressureLoc, plus many other trick modifications