RockiMtn":297d6uma said:
what model is the bigger/rounder beartrap style XT pedals… m730?
Yep. The 730 was the big, rounded beartrap. The 731 was a short-lived "squaretrap" with tall parallel-sided cages. The 735 came in two versions - one with a cartridge axle as pictured above, and the earlier model with a conventional axle and dustcap.
Here's a thread on the differences. The eBay links are all dead now, but scroll down for the pictorial summary:
http://www.retrobike.co.uk/forum/viewtopic.php?p=182396