Mule 2510 Rear Shock Substitutes

[Riddler]

Anyone know of a cost effective substitute for the OEM rear shock absorbers on a 2510? I have a hunch that there any number of ATV or motorcycle shocks whose dimensions, travel, dampening rate and bolt holes are close enough to work just fine on a 2510. The OEM units are $120 each, which seem a bit pricey for such a small, vanilla shock.