The RV-14 caps are used widely by LSA makers, so should not give any problems in service.
I don't think the retro-fit caps are made by Andair, they are made by the same company who makes the RV-14 caps - SPRL / Newton Consulting. At the risk of opening a hornet's nest, the SPRL retro-fit caps came first - Andair caps then appeared.
The old Deluxe caps that Van's used to sell ('Aero' caps), before the plastic caps were introduced, were also provided by Newton and are all metal. They are still available from Spruce/LAS, with a flange machined to the RV profile.
https://www.lasaero.com/products/article/Z032Y4DA5
http://www.aircraftspruce.com/catalo...p?recfer=23958
Pete