Yellow vs purple dogbone mount

[BlackPhaseOne]

After seeing everyone had the purple type mounts installed I was surprised to find that powerflex offers the yellow ones for the ph1 as well.
This is the link to the regular purple one, says it will fit both 172 and 182:
http://www.powerflex.co.uk/road-ser...Bone+(Twisted)+Engine+Mount+Bush+Kit/333.html
now here's the yellow one which says it will only fit the 172 one:
http://www.powerflex.co.uk/road-series/product-details/Dog+Bone+Engine+Mount+Bush+Kit/1830.html

From what iv'e read i think the yellow ones are slightly softer than the purple ones, and the black ones are the stiffest of them all.
wonder whats the difference between the purple and the yellow one ? anybody fitted the yellow mounts ?
I think it will work well with the new yellow right engine mount insert as well:
http://www.powerflex.co.uk/road-ser...t+Upper+Right+Engine+Mount+Insert+/11902.html

 

[marinemackay2003]

only thing between them is shore hardness of the rubber

Bushings are produced in one of three durometers – Yellow (70A, approximately 25% stiffer than stock), Purple (80A, approximately 30% stiffer than stock), and Black (95A, approximately 80% stiffer than stock)