FYI...For restorations, these SBR rubber grommets worked well for the NLA choke rod grommet #530002594
used on the Poulan 306/245 series. A little oil, some patience, and a chopstick will eventually work it in. I first tried
to pull/roll the flange in with a string, like the method used on some Stihl carb boots, but it didn't work this time.
I looked at McMaster-Carr & a bunch of other places for the exact OEM replacement, but all others were too small
on the overall diameter to look good. These were painted over, in with the whole saw case, at the factory.
Amazon - Standard Compound SBR Grommet, 5/8" OD x 3/16" ID, 11/32" Groove Diameter, 3/32" Groove Width, 60 Durometer (Pack of 10)
The 3/16" (0.188") opening allows the 0.210" diameter choke rod to operate tightly for a good dust seal.
A bit expensive, but worth it, at about $3.50 each once you include shipping. I split the pack of 10 with
my neighbor as I needed four of them. The actual panel hole in the carb box is 0.355" on the three saws I measured out...
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias=aps&field-keywords=Standard Compound SBR Grommet, 5/8" OD x 3/16" ID, 11/32" Groove Diameter, 3/32" Groove Width, 60 Durometer (Pack of 10)