No one else responded so....
Mine is a 4100 not 4600- it has a SPD-GS-6330. I just ordered all new gas springs from associated spring raymond-gave them the existing numbers and they matched them. Put the new ones on the fly bridge and bilge but not the back fender/electrical hatches yet. Going to replace the old brackets with stainless steel. (got them from asr too)
Don't know why Maxum put cheap brackets on the back, mine are rusting.
Looked up the gas spring for the 4600 on the Maxum web site parts, (http://www.maxumcustomercare.com/catalogs_index.html
) it doesn't give much info- Part #79086 STRUT,GAS,W/BALL JOINT,110LBS,SS
Good luck, M