Grommets (firewall forward)

[Rynoth]

After having to cut my 5th and 6th test flights short due to oil pressure readings fluctuating wildly low, I have traced the problem down to the rubber grommets I had used to protect my oil pressure sender wire(as well as CHT wires) where they pass through my Aerovee engine baffling. The grommets had basically come apart in 2 halves and the wire was chafing against the baffle hole. I had sourced the grommets both from Radio Shack (yes they were still open when I did my FWF) and Aircraft Spruce, and couldn't say for sure which ones I used.

What sort of grommets have held up over time in the hotter pars of the engine bay?

[Rynoth]

Quick follow up, I've ordered these nylon snap bushings from ACS to help with my problem:

https://www.aircraftspruce.com/catalog/ ... ckkey=9947