I'm sure you can find something close,if you keep the OEM sprayed with some WD40 or silicone spray they will last alot longer,the sun dries this stuff out and it cracks up
for about 3 years on all my exposed rubber parts including trailer and tractor tires and rubber parts – seems to be doing real well- not getting the usual sun rot
I have one of Ronalds aftermarket steer cylinder boots it has held well even bushogging corn and sunflowers