Which best Spark plug cap for a classic PX ?

wouahhh, so many spark plug caps.

Spark plug cap + wire NGK Racing, red
http://www.sip-scootershop.com/pages/details.php?ID=26296&SID=adc2f39b0dea65c7b79f40e2ed5bcfd1

Spark plug cap NGK, LB5F
http://www.sip-scootershop.com/pages/details.php?ID=9633&SID=adc2f39b0dea65c7b79f40e2ed5bcfd1

Spark plug cap PIAGGIO PX
http://www.sip-scootershop.com/pages/details.php?ID=23804&nosubnavi=1&SID=adc2f39b0dea65c7b79f40e2ed5bcfd1

Spark plug cap, 90°, with metal coating, interference suppressed
http://www.sip-scootershop.com/pages/details.php?ID=9758&nosubnavi=1&SID=adc2f39b0dea65c7b79f40e2ed5bcfd1

Spark plug cap ARIETE, 90°, silicone, red
http://www.sip-scootershop.com/pages/details.php?ID=19274&nosubnavi=1&SID=adc2f39b0dea65c7b79f40e2ed5bcfd1

Which one is the best ?

Regards

up

up :wink: