A few years ago harbor freight had this MASSIVE socket set on sale for 39.00 (now its only 49) and there was a 46mm.

I bought it for the same thing you want it for. I use them often for the bigger nuts esp the OIL FILTER..

Im sure you can grab it on sale for 39 if you get on the mailing list.

http://www.harborfreight.com/21-piece-metric-3-4-quarter-inch-heavy-duty-socket-set-5494.html

As far as a reamer... I used a 45 cal pistol brush to ream out my glow plug holes... Used some liquid wrench as well... Then Id get a long piece of old t-shirt and softly push it to get any other gunk off..

I did make sure it was a LONG piece so nothing could fall in...HAHA