Chad,
Not sure which bulbs you got or which of the two web sites you ordered from but you DEFINITELY didnt get the bulbs that they sent me. The ones I got are so very much brighter than the incandescent festoon blubs. Sorry you didnt get the same ones I have sent.
I see you ordered the standard led festoon bulbs. they are not very bright as you mentioned. The hi power ones are way way better than the OEM bulbs and no hotter , if not a bit less in temperature.
I see you wanted the 44 mm festoon and as you noted, they only have the hi power festoon led bulbs in the 42 mm size. 2 mm will not make one bit of difference in the installation since the thin flexible flat metal connections that are used to hold the bulb will fit any bulb that is even close to the right size and a 42mm bulb will fit fine. I made the mistake of buying one 39mm and one 42 mm since I was lazy to go check the actual correct size, which turned out to be 42mm. BUT, the 39 fit the front or the rear light assembly with no issues and it is 3mm smaller.
I did happen to notice that the 4410 bulb low power led you bought cost $2.49 each and the 4210 hi power led bulbs I bought from them cost $15 each. trust me, they are brighter.
I would offer to you to try the 42 mm hi power led bulb if you were interested in better lighting, the ones you bought are definitely less output, but the ones I bought are so very much more light with no more heat.
I would bet you they would be more than accomodating to swap the bulbs for the hi power ones since you are interested anyhow.
#4210 42mm hp LED festoon bulbs from
www.superbrightleds.com